List of Space Marine Chapters

This is a list of official Space Marine Chapters created by Games Workshop. It does not include any fan-created Chapters, though it does include the Traitor Legions and other Renegade Chapters of Chaos Space Marines as well as those Space Marine Chapters considered Excommunicate Traitoris by the High Lords of Terra whether they serve the Dark Gods or not. This is not a complete list as not every Chapter in existence in the Imperium of Man is known.

Please note: fan-created Chapters must be posted at the Warhammer 40k Fanon Wiki and not on this page. A separate list also exists for Renegade Space Marine Chapters and Chaos Space Marine warbands here.

Absolvers
The Absolvers are a Codex Astartes-compliant Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Adharon's Reavers
Adharon's Reavers are a vicious warband of Chaos Space Marines who were once largely members of the Sons of Guilliman Chapter of Space Marines.

Adulators
The Adulators are a Codex Astartes-compliant Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Alpha Legion
The Alpha Legion is the Chaos Space Marine Traitor Legion about whom the least is known. The Alpha Legion was once the XX Legion of Astartes created during the First Founding by the Emperor of Mankind to carry out his Great Crusade to reunite all of humanity in a new Golden Age under his rule. They are experts in infiltration and their armies contain many Chaos Cultists in addition to regular Chaos Space Marines. The Alpha Legion's Primarch was named Alpharius, who was actually one of the identical twin Primarchs Alpharius Omegon, two brilliant and secretive sons of the Emperor, one of whom was reportedly later killed after end of the Horus Heresy by Roboute Guilliman, the Primarch of the Ultramarines. Despite its seeming allegiance to Chaos, a closer scrutiny of the Alpha Legion's known history indicates that their seeming service to Chaos Undivided might actually be the greatest deception they have played upon the Imperium.

Altar Brethren
The Altar Brethren were once a Loyalist Space Marine Chapter of unknown origin and Founding. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, but by the time they made their way back into realspace, they had become the warband of Chaos Space Marines known as the Iconoclasts.

Angels Encarmine
The Angels Encarmine are a Second Founding Successor Chapter of the Blood Angels. This Chapter is very rarely at full strength due to their highly active nature and willingness to intervene anywhere in the galaxy to protect the Emperor's people.

Angels Eradicant
The Angels Eradicant are a Loyalist Codex Astartes-compliant Space Marine Chapter of unknown origin and Founding. Virtually nothing is known about this obscure Chapter within the official Imperial archives.

Angels of Absolution
The Angels of Absolution are a Second Founding Chapter of the Dark Angels. However, unlike their fellow Unforgiven, the Angels of Absolution feel that their shame in the eyes of the Emperor of Mankind has already been wiped away and they have earned his absolution, which has also led to them forgoing the use of the term "Unforgiven" in relation to themselves. As might be expected, this stance produces some conflict when the Angels of Absolution undertake joint operations with the Dark Angels and their fellow scions of Lion El'Jonson.

Angels of Damnation
The Angels of Damnation are a Codex Astartes-compliant Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Angels of Ecstasy
The Angels of Ecstasy are a Renegade Chapter of Chaos Space Marines devoted to the Chaos God Slaanesh who were once the Loyalist Space Marine Chapter called the Sons of Ulthunas. They rebelled against the Imperium of Man during the action remembered as the Ganymethian Betrayal. It is unclear if they are merely Renegade Space Marines who refuse to recognize Imperial rule or are now fully committed to the service of the Prince of Pleasure as Traitor Marines, though their increasingly mutated appearance and Chapter colour scheme would indicate that this is firmly the case.

Angels of Fire
The Angels of Fire are a Loyalist Space Marine Chapter of unknown origin, Founded during the 36th Millennium. It is unknown who their Primarch is or where their homeworld is located. It is possible that their gene-seed originated with the Ultramarines, the Dark Angels, the Blood Angels, or even the Salamanders. The Angels of Fire are a young but powerful Space Marine Chapter, and are willing to prove themselves in battle against the enemies of the Emperor.

Angels of Flame
The Angels of Flame are a Renegade Chapter of Chaos Space Marines about which little is known in Imperial records. The Angels of Flame Space Marine Chapter only recently turned Renegade in 999.M41, when they were sent on an extended mission of reconquest to the rim of the galaxy near the Ghoul Stars. Even now, Planetary Governors, Imperial Inquisitors and Imperial military commanders in the region wait with trepidation for the bloodshed that will surely follow when they next make an appearance as the newest servants of the Dark Gods.

Angels of Fury
The Angels of Fury are a Codex Astartes-compliant Loyalist Space Marine Chapter of unknown Founding and origin. Their Chapter homeworld is Ingiga in the Segmentum Solar, but almost nothing is known about the Chapter in Imperial records.

Angels of Iron
The Angels of Iron are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in Imperial records.

Angels of Penance
The Angels of Penance are a Codex Astartes-compliant Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Angels of Purgatory
The Angels of Purgatory are a Codex Astartes-compliant Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Angels of Redemption
The Angels of Redemption is a Second Founding Successor Chapter of the Dark Angels.

Angels of Repentance
The Angels of Repentance are a Codex Astartes-compliant Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Angels of Retribution
The Angels of Retribution are a Codex Astartes-compliant Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Angels of Vengeance
The Angels of Vengeance are a Second Founding Successor Chapter of the Dark Angels.

Angels of Vigilance
The Angels of Vigilance are a Loyalist Space Marine Chapter believed to have been created during the Second Founding from an unknown origin.

Angels Penitent
The Angels Penitent are a Codex Astartes-compliant Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Angels Porphyr
The Angels Porphyr are a Loyalist Space Marine Chapter that was Founded during the 31st Millennium, their actual Founding and origin remain unknown.

Angels Redeemed
The Angels Redeemed are a Codex Astartes-compliant Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Angels Repentant
The Angels Repentant are a Codex Astartes-compliant Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Angels Resplendent
The Angels Resplendent are a Codex Astartes-compliant Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Angels Revenant
The Angels Revenant are a Codex Astartes-compliant Loyalist Space Marine Chapter and a Successor Chapter of the Ultramarines. This Chapter's origins can be traced to the 8th Founding which allegedly occurred during the mid-34th Millennium, undertaken amid the dark times of the Nova Terra Interregnum, when the Imperium of Man had been split into twin interstellar empires. Ultimately, the Angels Revenant met their fate with the rise of the Necron Maynarkh Dynasty within the Orpheus Sector of the Segmentum Tempestus in 991.M41. It is believed that no more than a few hundred Angels Revenant survived the Necron assault upon their Chapter homeworld. The only survivors were those members of the Chapter who were far from the Orephus Sector on Crusade.

Angels Sanguine
The Angels Sanguine are a Loyalist Chapter of Space Marines and a Second Founding Successor Chapter of the Blood Angels. Theirs is a long and glorious history, having been pivotal in many victories against the Chaotic horrors that have emerged from the Eye of Terror. Yet the shadow of the Blood Angels' genetic Flaw lingers ever about the Angels Sanguine.

Angels Vermillion
The Angels Vermillion are a Second Founding Successor Chapter of the Blood Angels.

Angels Vindicant
The Angels Vindicant is a Loyalist Codex Astartes-compliant Space Marine Chapter of unknown origin and Founding. Virtually nothing is known about this obscure Chapter within the official Imperial archives.

Angron's Chosen
Angron's Chosen are a warband of Chaos Space Marines drawn from the World Eaters Traitor Legion. The warband is composed entirely of Khornate Berserkers. They are notable for taking part in the First War for Armageddon.

Annihilators
The Annihilators were once a Loyalist Space Marine Chapter of unknown origin or Founding. But eventually they fell from the light of the Emperor and became the Chaos warband known as the Beasts of Annihilation. Corrupted beyond recognition, these once-proud warriors are now sworn to the service of the Dark Gods, and allow the Daemons of the Warp to possess their superhuman Astartes bodies. As a result, this warband fields an unusually large number of Possessed Chaos Space Marine squads.

Apocalypse Company
The Apocalypse Company is a warband of Chaos Space Marines. Their allegiance to a particular Chaos God is unknown, but it is presumed that they worship Chaos in its Undivided form.

Apostles of Contagion
The Apostles of Contagion are a warband of Chaos Space Marines originally drawn from the Death Guard Traitor Legion that dedicate themselves to the service of the Plague Lord Nurgle. They are led by the vile and infamous Chaos Lord Necrosius, the self-proclaimed "Hand of Nurgle." The Apostles of Contagion are thought to be responsible for Plague Zombie infestations that broke out across the Imperial Armoury World of Vraks during the Siege of Vraks in 813.M41.

Apostles of MinthRas
The Apostles of MinthRas are a warband of Chaos Space Marines. They were first encountered by the forces of the Imperium of Man inside the Eye of Terror Warp rift in the 33rd Millennium. Almost nothing else is recorded about them in Imperial records.

Argent Hammers
The Argent Hammers were once a Loyalist Space Marine Chapter of unknown origin and Founding. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, but by the time they made their way back into realspace, they had become the warband of Chaos Space Marines known as the Talons of Anathrax, named for the Daemon World of Anathrax where they had been corrupted.

Astral Claws
The Astral Claws were once a Space Marine Chapter created during the mid-35th Millennium's 10th Founding from an unknown genetic origin specifically to defend the Eastern Fringes of the Imperium of Man from any Chaos threats spawned by the massive Warp rift called the Maelstrom in the region of the Ultima Segmentum appropriately called the Maelstrom Zone by Imperial astrocartographers. The Astral Claws eventually turned Renegade against the Imperium and initiated the major rebellion and attempt at secession from the Imperium by the Badab Sector appropriately called the Badab War in the late 41st Millennium. Upon losing this conflict to Loyalist Imperial forces, including several other Space Marine Chapters, the surviving Astral Claws were corrupted by Chaos and fled into the Maelstrom. They are currently the leaders of a powerful band of Chaotic pirates and Renegades called the Red Corsairs who present a major threat to Imperial commerce and Imperial worlds in the region.

Astral Fists
The Astral Fists are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is currently known about this Chapter in the Imperial records. Their only notable engagement was when they were ordered to engage the Tyranids Echidna Splinter Fleet sometime during the 41st Millennium.

Astral Knights
The Astral Knights were a Loyalist Space Marine Chapter from an unknown Founding and origin. The Astral Knights sacrificed their entire Chapter in 926.M41 to destroy the hideous threat to the Imperium called the Worldengine in the Vidar Sector. This Necron weapon was a planet-sized spacecraft, armed with Gauss Projectors capable of scorching entire planets of all life on their surface.

Aurora Chapter
The Aurora Chapter is a Loyalist Chapter of Space Marines of disputed Founding that is a Successor Chapter of the Ultramarines. The Armoury of the Chapter boasts more Predators and Land Raiders than any three other Loyalist Space Marine Chapters combined and they are thus specialised in armoured assaults. Their name has become a byword for armoured assault across the Ultima Segmentum of the Imperium of Man that serves as their primary area of operations.

Avengers
The Avengers are a Loyalist Space Marine Chapter of unknown Founding and origin about which almost nothing is known in Imperial records.

Avenging Sons
The Avenging Sons are a Codex Astartes-compliant Loyalist Space Marines Chapter originally created during the 19th Founding from the gene-seed of the Ultramarines. The Avenging Sons hail from the world of Traekonnis Major.

Beasts of Annihilation
The Beasts of Annihilation are a warband of Chaos Space Marines that were once the Loyalist Space Marine Chapter known as the Annihilators. Corrupted beyond recognition, these once-proud warriors are sworn to the service of the Dark Gods, and allow the Daemons of the Warp to possess their superhuman Astartes bodies. As a result, this warband fields an unusually large number of Possessed Chaos Space Marine squads.

Benedictors
The Benedictors are a Codex Astartes-compliant Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Berserkers of Skallathrax
The Berserkers of Skallathrax are a large warband of Chaos Space Marines drawn from the World Eaters Traitor Legion. There have been multiple encounters throughout the Segmentum Obscurus between the forces of the Imperium of Man and this vicious warband of Chaos Space Marines dedicated to the Blood God Khorne.

Betrayers of Pain
The Betrayers of Pain are a warband of Chaos Space Marines of unknown origin. Almost nothing is known about them in current Imperial records.

Black Brethren of Ayreas
The Black Brethren of Ayreas are a warband of Chaos Space Marines drawn from the Black Legion who follow the Chaos Champion Ayreas. They were among the Forces of Chaos and the 11 warbands and Renegade Chapters of Chaos Space Marines who participated in the the infamous Siege of Vraks (813-830.M41).

Black Consuls
The Black Consuls are a Loyalist Space Marine Chapter that were a Second Founding Successor or Primogenitor Chapter of the Ultramarines. The Black Consuls were recorded as having been annihilated at the Siege of Goddeth Hive in 455.M41 by elements of the Word Bearers Traitor Legion. Their current status is unknown, though Imperial records indicate that a force of Black Consuls is still operating in the Jericho Reach as part of the Achilus Crusade.

Black Crusaders
The Black Crusaders are a little-known Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records. The Black Crusaders were known to have been involved in an Imperial campaign in which they attacked an Ork enclave on the planet of Guilus II, and were the first to encounter the Grot Bomm Launcha.

Black Dragons
The Black Dragons are a Loyalist Space Marine Chapter from the Cursed 21st Founding. Their gene-seed is defective and riddled with mutation. Specifically, the Black Dragons' mutated Ossmodula organ can lead to the development of bony crests on the heads and arms of certain Space Marines of the Chapter. The affected Black Dragons Marines are formed into special units known as Dragon Claws.

Black Guard
The Black Guard are a Loyalist Space Marine Chapter and a rare Raven Guard Successor Chapter of the Second Founding. Much of this Chapter's history has been lost to Imperial records. .

Black Inculpators
The Black Inculpators are a Codex Astartes-compliant Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Black Legion
The Black Legion was once the XVI Space Marine Legion raised by the Emperor of Mankind on Terra during the closing days of the Unification Wars and were known as the Luna Wolves. They were commanded by the Emperor's most favoured son, the Primarch and later Warmaster Horus. After Horus was promoted to the rank of Warmaster so that he could lead the Great Crusade in the Emperor's absence when he returned to Terra, they were renamed the Sons of Horus in honour of their genetic forebear. When Horus fell on Davin's Plague Moon and was corrupted by the whims of the Chaos Gods, it was the Sons of Horus that led their fellow Traitor Legions in insurrection, inevitably leading them to Terra during the climax of the Horus Heresy where they carried out the infamous Siege of the Imperial Palace. When Horus was killed at the hands of the Emperor, the Sons of Horus fled into the Eye of Terror where they took on yet another name -- the Black Legion. Today, the Black Legion is led by Horus' self-proclaimed successor, Abaddon the Despoiler.

Black Psalm
The Black Psalm were once a Loyalist Space Marine Chapter of unknown origin and Founding known as the Illustrians. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, but by the time they made their way back into realspace, they had become the warband of Chaos Space Marines known as the Black Psalm.

Black Templars
The Black Templars are a Loyalist Second Founding Space Marines Chapter derived from the Imperial Fists' gene-seed and their Primarch, Rogal Dorn. Their origin can be traced back to the Imperial Fists’ defence of Terra during the Horus Heresy. Since that time, the Black Templars have been on the longest Crusade the Imperium of Man has ever known to prove their loyalty to the Emperor of Mankind.

Black Wings
The Black Wings are a Loyalist Codex Astartes-compliant Space Marine Chapter of unknown origins and Founding. Little else is known of this Chapter's history within the Imperial archives.

Blades Eternal
The Blades Eternal were once a Loyalist Space Marine Chapter of unknown origin and Founding. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, and their current status is also unknown, though the Imperial Inquisition has withheld their final judgement on whether or not the Chapter should be considered heretical or extinct until more information is available.

Bleak Brotherhood
The Bleak Brotherhood is a warband of Chaos Space Marines whose origins remain unknown although they may possibly be a splinter warband of the Warp Ghosts. The Chaos God to whom they offer their allegiance, if any, is unknown.

Blighted Claw, The
The Blighted Claw were once a Loyalist Space Marine Chapter of unknown origin and Founding known as the Sanctors of Terra. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, but by the time they made their way back into realspace, they had become the warband of Chaos Space Marines known as The Blighted Claw.

Blood Angels
The Blood Angels are one of the 20 First Founding Legions of the Space Marines. They are well known for their bloodthirsty nature in battle, and feared for the curse of flawed gene-seed they carry. The Blood Angels are among the longest-lived of the Adeptus Astartes, with some of the Chapter's Space Marines having served the Emperor of Mankind for over a thousand standard years. Thanks to recent events, the Blood Angels' numbers have been severely depleted. Under the threat of extinction, and in order to quickly replenish their numbers, the Blood Angels were forced to ask their kindred Successor Chapters from subsequent Astartes Foundings for a tithe of warriors from the related Chapters' pools of Neophytes, their candidate Space Marines. With these tithes of new recruits, the Blood Angels were more quickly able to replenish their losses, though they still face a time of trial like none the Chapter has known since the days of the Horus Heresy.

Blood Disciples
The Blood Disciples are a warband of Chaos Space Marines who were once the 8th Company of the Emperor's Wolves Chapter of Loyalist Space Marines. During a mission, the 8th Company made a Warp Jump that proved unsuccessful, causing them to be come lost in the Immaterium for decades. During this time the 8th Company was corrupted by Chaos and emerged back into realspace decades later as the vicious warband of Chaos Space Marines known as the Blood Disciples. Because the 8th Company of the Emperor's Wolves had oiginally been designated as one of that Chapter's assault companies, the Blood Disciples possess an unusually large number of Chaos Raptors, the Chaos Space Marines' equivalents of Assault Marines. Due to their chosen name, the warband is very likely dedicated to the service of the Blood God Khorne, but this is not confirmed and the Blood Disciples might also serve Chaos Undivided. Nothing else is known about the warband in Imperial archives.

Blood Drinkers
The Blood Drinkers are a Loyalist Space Marines Chapter and a Second Founding Successor Chapter of the Blood Angels. The name "Blood Drinkers" comes from the Chapter's craving for blood, the result of a mutated omophagea gene-seed organ. The Blood Drinkers Chapter Master is Orloc, who participated alongside his Battle-Brothers in the heroic defence of the Blood Angels' homeworld of Baal from the Forces of Chaos and the Tyranids in 999.M41.

Blood Gorgons
The Blood Gorgons are a Renegade Chapter of Chaos Space Marines that primarily raids the Baston Sector of Imperial space. They are an unusual Chapter of Chaos Space Marines, as every Astartes is ritually bonded to another through the use of a Chaotic ritual. The Blood Gorgons, who value their freedom and independence above all else, refuse to swear allegiance to any patron Chaos God, preferring to serve Chaos in general in the form of Chaos Undivided.

Blood Legion
The Blood Legion are a Loyalist Space Marine Successor Chapter of the Blood Angels that were created during an unknown Founding. Almost nothing is currently known about this Chapter in Imperial records.

Blood Legion of Khorne
The Blood Legion of Khorne are a warband of Khornate Berserkers drawn from the World Eaters Traitor Legion. Their most notable campaign was when they assaulted the world of Lorn V and struck a deal with the Ork Warboss Gorgutz. The Blood Legion of Khorne eventually came into conflict with the Orks over the remnants of an ancient Imperator-class Titan.

Bloodlords
The Bloodlords were once a Loyalist Space Marine Chapter of unknown origin and Founding known as the Spears of Olympus. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, but by the time they made their way back into realspace, they had become the warband of Chaos Space Marines known as the Bloodlords.

Blood Ravens
The Blood Ravens are a Loyalist Space Marine Chapter of unknown origins and Founding. The origins of the Blood Ravens are shrouded in mystery. This elusive Chapter has always been drawn to the pursuit of knowledge and the acquisition of ancient lore and produces an unusually high number of Librarians among its ranks as a high proportion of Neophytes develop psychic abilities soon after their implantation with the Blood Ravens' gene-seed organs. The powerful Blood Ravens Librarians guide the Chapter, enabling them to fight with a precision and calculated fury made possible by their ability to predict and thwart their enemy's strategies and tactics before they come to pass. These arcane powers have led to great speculation and some worry about the true nature and origins of this Chapter in the rest of the Imperium of Man.

Blood Swords
The Blood Swords are a Codex Astartes-compliant Loyalist Space Marine Chapter that was created using the gene-seed of the Blood Angels. The Blood Swords' Founding date is not known. The Blood Swords' homeworld is the planet Jaggafall. The Blood Swords Chapter is unique among the Space Marines in that for a time its Chapter Master, Daggan, was actually a Venerable Dreadnought.

Brazen Claws
The Brazen Claws is a Second Founding Successor Chapter of the Iron Hands.

Brazen Minotaurs
The Brazen Minotaurs are a Loyalist, Codex Astartes-compliant Space Marine Chapter of unknown Founding and origin. Their Chapter homeworld is called Tauron. Little of substance is known about the Chapter in Imperial records, though what is known is that the Chapter has worked closely with the Raven Guard Chapter on several occasions, and a close relationship has developed between the two as a result. The Brazen Minotaurs are only concerned with the destruction of their foes in as quick and as clean a way as possible. They prefer to meet their enemies head-on, looking them in the eyes before taking their lives. The Chapter’s strategies are not subtle. They do not need to understand their enemy since such knowledge is unnecessary in order to strike him down. The Chapter possesses an unwavering and unquestioning approach to battle as they storm their way to victory after victory in the name of the Emperor. The Brazen Minotaurs always act as a fist of iron driven into the very heart of the enemy.

Brazen Skulls
The Brazen Skulls were a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records. Their only notable engagement was when they took part in the Sabbat Worlds Crusade fighting in support of the reincarnated Saint Sabbat. The Brazen Skulls were eventually wiped out as a Chapter by 773.M41.

Broken, The
The Broken were once a Loyalist Space Marine Chapter of unknown origin and Founding known as the Viridian Consuls. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, but by the time they made their way back into realspace, the Viridian Consuls had become the warband of Chaos Space Marines known as The Broken.

Bronze Gorgons
The Bronze Gorgons were once a Loyalist Space Marine Chapter of unknown origin and Founding. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, but by the time they made their way back into realspace, they had become the warband of Chaos Space Marines known as the Crystal Wyverns.

Brotherhood of Darkness
The Brotherhood of Darkness are a warband of Chaos Space Marines of unknown origin and allegiance.

Brotherhood of Lethe
The Brotherhood of Lethe were once a Loyalist Space Marine Chapter of unknown origin and Founding known as the Crusaders of Dorn. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, but by the time the Crusaders of Dorn made their way back into realspace, they had become the warband of Chaos Space Marines known as the Brotherhood of Lethe.

Brothers of Livos
The Brothers of Livos are a fanatical warband of Chaos Space Marines that are highly devoted to the Ruinous Powers, willingly offering themselves up to the Chaos Gods for possession by immaterial beings. Members of the Brothers of Livos often become Possessed Chaos Space Marines, which is viewed as a great honour within the warband.

Brothers Penitent
The Brothers Penitent is one of the Loyalist Space Marine Chapters Founded as part of the Astartes Praeses - one of the 20 Chapters of Astartes mentioned in the ancient tome known as the Mythos Angelica Mortis that was created to defend the regions surrounding the Eye of Terror in the Segmentum Obscurus from the Forces of Chaos. The Brothers Penitent are of an unknown Founding and origin. Though this Chapter works alongside those of the Astartes Praeses, they have a reputation for being insular in nature.

Brotherhood of a Thousand
The Brotherhood of a Thousand is a Loyalist Codex Astartes-compliant Chapter of unknown origin and Founding.

Brotherhood of the Plague
The Brotherhood of the Plague are a Chaos Space Marine warband of unknown origin. This warband's corrupted Astartes are ardent followers of the Plague God Nurgle. The Brotherhood of the Plague's most notable action occurred in 104.M35, when they took part in the notorious Bloodpox Campaign, fighting alongside the Death Guard Traitor Legion against the Dark Angels Space Marine Chapter. The twelfth Supreme Grand Master of the Dark Angels Chapter, the esteemed Armaros, contracted the loathsome pox known as Nurgle's Rot. This resulted in his rapid deformation, and so, Armaros passed on the leadership of the Chapter and voluntarily committed suicide by stepping into The Rock's reactor chamber so as to prevent the contamination from spreading.

Brothers of the Anvil
The Brothers of the Anvil were once a Loyalist Space Marine Chapter of unknown origin and Founding. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Abyssal Crusade. During their sojourn into the Eye, they landed upon an ancient Eldar Crone World and were captured by xenos Kabalites. After enduring horrific torture at the hands of their Dark Eldar captors the remains of the Brothers of the Anvil slaughtered their way back into realspace, unrecognisable as a formerly loyal Chapter. Now a Chaos warband, known as the Deathmongers, they have a brutal reputation for causing wanton destruction during their campaigns even to the point that they will cede a possible victory for the opportunity to cause more death and devastation for its own sake.

Carcharodons
The Carcharodons are a Loyalist Space Marines Chapter of brutal reputation that was Founded during the 23rd Founding. They are a Successor Chapter of the Eagle Warriors. The Carcharodons participated in the latter stages of the Badab War. They were a fleet-based Chapter until in recompense for their role in the Badab War they were given control over the Mantis Warriors Chapter's territory in the Maelstrom Zone of the Ultima Segmentum, a group of Feral and Feudal Worlds called the Endymion Cluster. The Carcharodons may actually be the same Chapter as the Space Sharks; the term Carcharodons may simply be a fragment of their name translated into High Gothic for that same unit of Astartes.

Celebrants
The Celebrants Chapter was Founded during the 36th Millennium. It is unknown what Chapter provided their gene-seed. Their only mention in Imperial history is that they were ordered to withdraw from the world of Phaethon IV and instead to take up garrison duty on the Ecclesiarchy's Cardinal World of Nedicta Secundus to protect the holy relics of the Adeptus Ministorum found there from the ravages of the Tyranid Hive Fleet Kraken.

Celestial Guard
The Celestial Guard are a Loyalist Space Marine Chapter created during the 25th Founding from the gene-seed of the Crimson Fists. Their Chapter homeworld is called Erenon and is a storm-shrouded Ocean World located to the galactic northwest of Nocturne.

Celestial Lions
The Celestial Lions are a Loyalist Space Marine Chapter raised in the 38th Millennium during an unknown Founding as a Successor Chapter of the Imperial Fists. The Chapter has a long and glorious history, stretching back over 4,000 standard years, but events set in motion over a decade ago during a routine assault on the world of Khattar in 988.M41 may now prove to be the Chapter's undoing in the wake of the events that unfolded during the Third War for Armageddon. The Celestial Lions are deeply distrustful of the motives and methodology employed by the Inquisition, and are vocal opponents of its recent actions during the Khattarn Insurrection. This political opposition and demand for investigations into the Inquisition's dealings has raised the hackles of many important people within the Imperium's most senior circles. This may have contributed to the recent misfortune which nearly destroyed the Chapter.

Charnel Guard
The Charnel Guard are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in Imperial records other than the participation in the defence of the Maelstrom Zone from the Chaos Renegades of the nearby Warp rift of the same name.

Children of Purgatos
The Children of Purgatos are a Renegade Chapter of Chaos Space Marines of unknown Founding and origin, that was declared Excommunicate Traitoris by the High Lords of Terra for reasons that are not listed in Imperial records. What remains of the Chapter now operates as a Chaos Space Marine warband. The warband was founded and is currently led by Battle Psyker Kerberos. The Children of Purgatos specialise in undertaking ship-to-ship boarding actions as they often operate as pirates and reavers of Imperial shipping.

Chorus of Eltain
The Chorus of Eltain were once a Loyalist Chapter of Space Marines of unknown origin and Founding. They were lost after entering the Eye of Terror in 321.M37 as part of the Imperial Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, and they were declared Martyr Extremis by the Imperial Inquisition, considered to have been wiped out by the Forces of Chaos.

Chosen of Nemeroth
The Chosen of Nemeroth are a warband of Chaos Space Marines who were led by the infamous Chaos Sorcerer Nemeroth. Nemeroth led his Chaos warband in an attempt to conquer the Imperial Forge World of Graia located in the Segmentum Tempestus in the late 41st Millennium that was defeated by the Ultramarines 2nd Company under the command of Captain Titus. The Chosen of Nemeroth were known to make extensive use of daemons as allies. The origin of the Chaos Space Marines in this warband; i.e., whether they were taken from one of the existing Traitor Legions, had originated as Loyalist Space Marines or had been drawn from other Renegade warbands, is unknown. Little else is known about this warband in Imperial records.

Claws of Lorek
The Claws of Lorek are a warband of Chaos Space Marines of unknown origin or Founding. They have been noted by Imperial scholars as a possible splinter group of the Renegade Badab Primaris Chapter. Allegedly, this splinter group went on a separate path of escape from the rest of their former Chapter during the final assault on Lufgt Huron's Palace of Thorns on Badab Primaris at the conclusion of the Badab War. Their current warleader, the Chaos Champion Lorek, has maintained the warband's allegiance to Huron Blackheart. The Claws of Lorek have been known to take on various assignments to find artefacts of power, to sow mayhem and destruction among the worlds of the Imperium, or to recruiting deep within the borders of the Imperium of Mankind's Ultima Segmentum to find disgruntled Imperial citizens or Renegade Space Marines willing to join their cause.

Cleaved
The Cleaved are a warband of Chaos Space Marines of unknown origin and allegiance. These mysterious warriors first appeared during the insurrection on the world of Magma Codelian. The Loyalist Imperial Guardsmen of the 334th Iridian Regiment had pushed their way into the rebellious Planetary Governor's palace after a sustained bombardment. The regiment's Primaris Psykers realised too late that the architecture of the Governor's keep was actually a gigantic summoning circle. Amongst the choking fumes, the insurrectionists conjured reinforcements; not Daemons, but Chaos Space Marines with strange, oil-like blood oozing from the joints in their armour. Though the new arrivals were massively outnumbered, the Power Armoured warriors exhibited an incredibly high pain threshold, fighting on through mortal wounds to eventually repel the Iridians' attack and secure the planet for the insurrectionists.

Clerics of Steel
The Clerics of Steel were once a Loyalist Space Marine Chapter of unknown origin and Founding. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, but by the time they made their way back into realspace, they had become the warband of Chaos Space Marines known as the Invocators.

Company of Misery
The Company of Misery is a warband of Chaos Space Marines of unknown allegiance. Since the degradation of their gene-seed stocks in the 32nd Millennium, the formerly Loyalist Chapter known as the Desolate Brotherhood found themselves assigned to impossibly dangerous and undesirable duties, including assaults on Death Worlds, Space Hulks and quarantine zones. Each time the Brotherhood believed they had won a reprieve, they were sent on an even more hazardous mission, plunging them into a spiral of dissolution and despair. After a catastrophe in the acid swamps of the world of Misery, the Chapter took a new name and left their duties behind, forever becoming sworn enemies of the Imperium and the illusion of hope. They were first encountered by Imperial forces on the world of Maddean IV in the 37th Millennium. A recent search of Imperial records concerning this warband led to the discovery of connections in the records between the Company of Misery and the Brethren of Mystery. Whether this is another unit of Chaos Space Marines with some prior connection to the Company of Misery is unknown at this time.

Company of the Shadow
The Company of the Shadow were a formerly Loyalist Space Marine Chapter known as the Death Falcons that were Founded during the dawn of the 41st Millennium. Hailing from the night-shrouded world of Bastonbeil. During the Conclave of Gathalamar, when the Chapter Master was away renewing his oaths of allegiance to the Emperor, something ancient and evil awoke beneath the underhive of Bastonbeil's capital city of Shadowhive, which served as the Chapter's Fortress-Monastery. This mysterious entity devoured millions of souls, leaving only mindless zombies in its wake. The Chapter responded in force, deploying the entire Chapter. It is unknown what transpired within the dark depths of the underhive, but after three months they emerged from the pits of blackness as grey-armoured, nightmarish spectres. They were no longer the Death Falcons, they had become the Chaos warband known as the Company of the Shadow.

Consecrators
The Consecrators are a Successor Chapter of Loyalist Space Marines created from the gene-seed of the Dark Angels. The Consecrators are noted for bearing all manner of holy relics and ancient patterns of arms, armour and vehicles. They appear to have inherited the most revered arms and armour of the original Dark Angels Space Marine Legion, preserving them lovingly, and bearing them down the through the ages against the foes of the Emperor of Mankind.

Contenders
The Contenders are a Codex Astartes-compliant Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Corpsemakers
The Corpsemakers are a warband of Chaos Space Marines derived from the Black Legion.

Corpus Brethren
The Corpus Brethren are a warband of Chaos Space Marines dedicated to the Pleasure God Slaanesh. They were once a Loyalist Chapter of Space Marines of unknown origin and Founding, known as the Sentinels Chapter. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Imperial Abyssal Crusade. During their sojourn into the Eye, the Sentinels found signs of Chaos Space Marine infestation and made planetfall on the Daemon World of Oliensis. The Sentinels hunted down and exterminated the goat-headed hedonists, but the cacophony of combat stirred Slaaneshi Noise Marines and soon the battle was joined. The raging conflict stirred the living planet itself, which swallowed the combatants into a large chasm. By the time they reemerged, the Sentinels were no longer recognisable, having been transformed into the Corpus Brethren.

Crimson Castellans
The Crimson Castellans were a Loyalist Space Marine Chapter of unknown origins and Founding who became embroiled in a civil war after a portion of their number turned to Chaos but were largely destroyed when the Tyranid Hive Fleet Jormungandr unexpectedly descended upon the world of Sephrax where they were battling their Renegade brethren. The Chapter homeworld of Vorl Secundus was subsequently abandoned and it is unknown whether the Chapter still exists in some form.

Crimson Consuls
The Crimson Consuls are a Loyalist Space Marine Chapter of unknown Founding who are a Successor Chapter of the Ultramarines. They were destroyed entirely by the machinations of the Alpha Legion Chaos Space Marines, possibly on the orders of Alpharius (or Omegon masquerading as Alpharius) himself.

Crimson Fists
The Crimson Fists are one of the Successor Chapters created during the Second Founding, drawn from the Imperial Fists Legion. Though they remain understrength from the Ork invasion of Rynn's World, the Crimson Fists are a proud and stubborn Chapter, never admitting defeat.

Crimson Guard
The Crimson Guard are a Codex Astartes-compliant Space Marine Chapter created by using the gene-seed of the Crimson Fists Chapter. Almost nothing else is known about them in Imperial records.

Crimson Paladins
The Crimson Paladins is a Loyalist Codex Astartes-compliant Space Marine Chapter of unknown origin and Founding. Virtually nothing is known about this obscure Chapter within the official Imperial archives, except the name of the Chapter's homeworld of Fortress and their fortress-monastery, which is known as Honour Hold. Much of this fortress is below ground as added protection against orbital strikes.

Crimson Sabres
The Crimson Sabres were once a Loyalist Space Marine Chapter of unknown origin and Founding, until they began their descent into Heresy on the Jungle World of Umidia with the genocidal purging of the Balethu Cults in 928.M41. As punishment (or possibly reward) for the bloody annihilation of his worshipers, the Blood God Khorne cursed the Crimson Sabres to be haunted by the voices of those they had slain. Driven to madness, they Crimson Sabres set upon another innocent world and slaughtered its population as well. The carnage temporarily silenced the voices in their heads but eventually they returned to plague them once more. The Chapter was soon declared Renegaded by both the Inquisition and the High Lords of Terra due to signs of continued psychological instability and over-zealous prosecution of their campaigns. Sevastus Kranon, the Chapter Master of the Crimson Sabres, led his warriors into the Eye of Terror to slaughter Traitors instead of spilling the blood of innocents, thereby gaining a temporary respite. Within the Eye, they became fully corrupted by the Dark Gods. When they returned to realspace, they had become the Chaos warband known as the Crimson Slaughter.

Crimson Scions
The Crimson Scions are a Loyalist Space Marine Chapter of unknown origins and Founding. Virtually nothing is known about this obscure Chapter within the official Imperial archives, except that they are located near the Imperial Hive World of Minea within the Segmentum Ultima.

Crimson Scythes
The Crimson Scythes are one of the Loyalist Space Marine Chapters Founded as part of the Astartes Praeses - one of the 20 Chapters of Astartes mentioned in the ancient tome known as the Mythos Angelica Mortis that was created to defend the regions surrounding the Eye of Terror in the Segmentum Obscurus from the Forces of Chaos. The Crimson Scythes are of an unknown Founding and origin.

Crimson Shades
The Crimson Shades is a Loyalist Space Marine Chapter of unknown origin and Founding. Virtually nothing is currently known about this obscure Chapter within official Imperial records. The Librarians of the Crimson Shades, like their counterparts of the Space Wolves and the White Scars Chapters, are one of the noteworthy examples that take exception to the doctrines of the Codex Astartes. Though the role of this Chapter's Librarians is not so different from the traditional role found for Librarians in more orthodox Chapters, it is in the methods they employ that they differ significantly from the majority of the Adeptus Astartes. Exactly what this difference is has not yet been recorded.

Crimson Slaughter
The Crimson Slaughter is a warband of Chaos Space Marines of unknown Founding and origin. They were once known as a Loyalist Space Marine Chapter called the Crimson Sabres until they began their descent into Heresy on the Jungle World of Umidia with the genocidal purging of the Balethu Cults in 928.M41. As punishment (or possibly reward) for the bloody annihilation of his worshipers, the Blood God Khorne cursed the Crimson Sabres to be haunted by the voices of those they had slain. Driven to madness, they Crimson Sabres set upon another innocent world and slaughtered its population as well. The carnage temporarily silenced the voices in their heads but eventually they returned to plague them once more. The Chapter was soon declared Renegaded by both the Inquisition and the High Lords of Terra due to signs of continued psychological instability and over-zealous prosecution of their campaigns. Sevastus Kranon, the Chapter Master of the Crimson Sabres, led his warriors into the Eye of Terror to slaughter Traitors instead of spilling the blood of innocents, thereby gaining a temporary respite. Within the Eye, they became fully corrupted by the Dark Gods. When they returned to realspace, they had become the Chaos warband known as the Crimson Slaughter.

Crusaders
The Crusaders are a Codex Astartes-compliant Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Crusaders of Dorn
The Crusaders of Dorn were once a Loyalist Space Marine Chapter of unknown origin and Founding. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, but by the time they made their way back into realspace, they had become the warband of Chaos Space Marines known as the Brotherhood of Lethe.

Crystal Wyverns
The Crystal Wyverns are a warband of Chaos Space Marines. They were once a Loyalist Chapter of Space Marines of unknown origin and Founding known as the Bronze Gorgons. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Imperial Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, but by the time they made their way back into realspace, they had become the warband of Chaos Space Marines known as the Crystal Wyverns.

Damned Company of Lord Caustos
The Damned Company of Lord Caustos is a warband of Chaos Space Marines of unknown Founding and origin. These Astartes turned to the Chaos Gods after being declared Excommunicate Traitoris by an Inquisitor of the Ordo Hereticus, based on some flimsy and circumstantial evidence. They only turned to Chaos to survive in a galaxy hostile to them. They now live their lives as mercenaries for hire to the highest bidder, and will take Imperial clients under certain circumstances. The Damned Company of Lord Caustos is counted amongst the Renegade Space Marine Chapters by the Imperium of Man.

Dark Angels
The Dark Angels are considered amongst the most powerful and secretive of the Loyalist Space Marine Chapters. They were the I Legion of the original 20 Space Marine Legions to be created during the First Founding of the 30th Millennium. Though they claim complete allegiance and service to the Emperor of Mankind, their actions and secret goals at times seem at odds with that professed loyalty, as the Dark Angels strive above all other things to atone for an ancient crime of betrayal committed over 10,000 standard years ago against the trust of the Emperor during the time of the Great Crusade and the Horus Heresy.

Dark Crusaders
The Dark Crusaders are a Loyalist Space Marine Chapter of unknown origins and Founding. Nothing else is currently known about them in Imperial records.

Dark Eagles
The Dark Eagles are a Loyalist Codex Astartes-compliant Space Marine Chapter of unknown origin and Founding. Unfortunately, at this time almost nothing is known about the Chapter beyond their name and Chapter appearance.

Dark Hands
The Dark Hands are a Codex Astartes-compliant Chapter of unknown origins.

Dark Hunters
The Dark Hunters are a Space Marine Chapter of unknown founding date or origin.

Dark Sons
The Dark Sons are a Loyalist Space Marine Chapter of unknown Founding and origin, though the Dark Sons themselves believe that they are Successors of the Novamarines Chapter. The Dark Sons' homeworld is the planet Darkhold located in the Segmentum Obscurus. Little else is known about the Chapter in current Imperial records.

Dark Tusks
The Dark Tusks Chaos Space Marines are a Renegade Chapter or a simple warband of Chaos Space Marines apparently sworn to the service of Nurgle. The Dark Tusks served as mercenaries in the Halo Stars,often serving the agenda of those with nefarious or Chaotic agendas. Evidence suggests the Dark Tusks are followers of Nurgle, but they were encountered, by Squad Damocles of the Iron Snakes Chapter of Space Marines, fighting alongside a Chaos Cult dedicated to Tzeentch, the Chaos God of Sorcery, on the world of Rosetta. The Dark Tusks wore corroded, rotten Power Armour and smelled of putrescence, decayed flesh and disease. They also carried an array of daemon weapons and "plague weapons". Unlike the majority of Dark Tusks, the leader wore shiny, uncorroded black armour with chain looped about him. The Dark Tusks are described as so degraded in their actions that they were more like animals than men when they were cornered by a Kill-team of the Iron Snakes on Rosetta.

Death Eagles
The Death Eagles are a Loyalist, Codex Astartes-compliant Space Marine Chapter. It is suspected that they are one of the rare Successor Chapters of the Raven Guard. Their exact Founding date is unknown. Unfortunately, at this time almost nothing is currently known about the Chapter in Imperial records beyond their name and Chapter appearance.

Death Guard
The Death Guard are one of the Traitor Legions of Chaos Space Marines. They worship and devote themselves exclusively to the Chaos God Nurgle and as a result of his mutational "gifts" they have become Plague Marines; Astartes who are eternally rotting away within their Power Armour and infected with every known form of disease and decay but who are immune to all pain or minor injury. When the XIV Legion was first raised on Terra by the Emperor, its Astartes were known as the Dusk Raiders. After the XIV Legion was reunited with its Primarch Mortarion on the world of Barbarus he remarked, "You are my unbroken blades. You are the Death Guard."

Death Knights
The Death Knights are a Loyalist, Codex Astartes-compliant Space Marine Chapter of unknown origin and Founding. Nothing else is recorded about them in Imperial records.

Death Mongers
The Death Mongers are a warband of Chaos Space Marines of unknown origin and Founding. They were once a Loyalist Chapter of Space Marines known as the Brothers of the Anvil. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Imperial Abyssal Crusade. During their sojourn into the Eye, they landed upon an ancient Eldar Crone World and were captured by xenos Kabalites. After enduring horrific torture at the hands of their Dark Eldar captors the remains of the Brothers of the Anvil slaughtered their way back into realspace, unrecognisable as a formerly Loyal Chapter. As the Death Mongers, they have a brutal reputation for causing wanton destruction during their campaigns even to the point that they would cede a possible victory for the opportunity to cause more death and devastation for its own sake.

Death Shadows
The Death Shadows are a Renegade Chapter of Chaos Space Marines who were once a Loyalist Chapter of Astartes known as the Lionguard before they were corrupted in the 37th Millennium during their participation in the Abyssal Crusade. They are known to specialise in the use of sabotage and terror tactics against their foes. In the late 41st Millennium, the Death Shadows withdrew to the Fortress World of Sybari after a disastrous campaign against the Ultramarines. Whilst in the planning stages of a retaliatory strike against their hated Loyalist foes, a tendril of Hive Fleet Behemoth invaded the Sybari System and consumed the planet. The current whereabouts of the Death Shadows are unknown.

Death Spectres
The Death Spectres are a Loyalist Chapter of Space Marines of unknown origin of the 13th ("Dark") Founding, only the second known Chapter of Astartes, besides the Exorcists, to have been created in that unusual Founding. They are possibly a Successor Chapter of the Raven Guard as they share the same mutations as found in that Chapter's gene-seed. Like the Raven Guard, the Battle-Brothers of this Chapter possess a minor mutation that causes the Melanchromic Organ (which controls the amount of melanin in an Astartes' skin tone) to not function properly, leading to the development of albinism in Death Spectres Astartes. They participated in the Siege of Lelithar and the defence of the Cadian Sector against the 13th Black Crusade.

Death Strike
The Death Strike is a Loyalist Space Marine Chapter of unknown origin and Founding whose Fortress-Monastery is located on their homeworld of Nihilas. They are very similar in appearance to the Rainbow Warriors Chapter. This Chapter participated in multiple campaigns, including the Assault on Moros, the Verdan II Extraction, the Ulik Sector campaign and the 13th Black Crusade.

Deathwatch
The Deathwatch are not an actual Space Marine Chapter. Instead, they are comprised of Kill-squads formed from the Veteran Space Marines of other Chapters that serve as the Chamber Militant of the Ordo Xenos of the Imperial Inquisition.

Desert Lions
The Desert Lions are a Loyalist Space Marine Chapter of unknown origin and Founding who fought in Operation Carthage during the 31st Millennium to retake the world of Istvaan V from the Forces of Chaos who had controlled it since the first days of the Horus Heresy. Nothing else is known about the Chapter in Imperial records.

Destroyers
The Destroyers are a Loyalist Space Marine Chapter and a rare Second Founding Successor Chapter of the White Scars. Nothing else is recorded about the Chapter in Imperial records.

Dictators
The Dictators are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Disciples of Caliban
The Disciples of Caliban are a Successor Chapter of the Dark Angels Legion. The creation of the Disciples of Caliban was unusual, in that then-Chapter Master Anaziel of the Dark Angels specifically requested the creation of a new Space Marine Chapter from Dark Angels gene-seed of the High Lords of Terra sometime during the 37th Millennium. Such a request by one Chapter for the creation of another was, and remains, unheard of in the Imperium of Man, and much debate followed among the members of the Senatorum Imperialis on Terra before Anaziel's request was granted. It is rumored among the Unforgiven that this Chapter of their fellowship was founded with the sole purpose of hunting down and capturing the infamous Fallen Angel known as Cypher. The Disciples of Caliban is a very mobile force of Astartes. Their Chapter fleet has been seen in conflicts all over of the Imperium since their Founding.

Disciples of Destruction
The Disciples of Destruction are a warband of Chaos Space Marines of unknown origin or Founding. They were first sighted by Imperial forces in 998.M41.

Doom Eagles
The Doom Eagles are a Loyalist Space Marines Chapter and a Second Founding Successor Chapter of the Ultramarines. The homeworld of the Doom Eagles is Gathis II. Atop the Ghostmountain, their world's largest peak, sits their mighty fortress-monastery, the Eyrie. The Doom Eagles are a notoriously pious, grim and aloof Chapter of Astartes. However, unlike the Ultramarines, their use of Dreadnoughts is more extensive, fitting with their belief that they are fighting while already dead. They emphasize the use of stealth tactics and speed in combat. At a basic level, all Doom Eagles accept that they are already dead men in the service of the Emperor of Mankind. This is the root of their courage and their unshakable resolution and determination to stand in the face of even the greatest odds. As such, the Space Marines of this Chapter are almost impossible to deter from doing their duty, but they are a dour, grim and depressive lot, albeit staunchly loyal to the Emperor and the Imperium.

Doom Legion
The Doom Legion is a Space Marine Chapter of unknown Founding or origin of which little is known in the Imperial records. The Doom Legion was once responsible for the maintenance and garrison of the Faithful's Deliverance, the pre-Horus Heresy star fortress that overlooks the notorious Elusian Maze asteroid fields. Few other Space Marine Chapters could boast of spaceborne firepower of this magnitude. All that was known about the Doom Legion's homeworld, Elusia Prime, is that it was situated within the Ultima Segmentum. During the Imperial Abyssal Crusade in 321.M37, the Doom Legion was lost in the Eye of Terror and reemerged into Imperial space centuries later as the warband of Chaos Space Marines known as the Vectors of Pox.

Doom Warriors
The Doom Warriors are a Codex Astartes-compliant Loyalist Space Marine Chapter of unknown Founding and origin. The Doom Warriors have a defect in the Catalepsean Node as a result of a mutation in their gene-seed. Because of this deficiency, Doom Warriors are incapable of true sleep, which in turn makes them a morose, moody Chapter. This is why they specialize in conducting Exterminatus campaigns that allow them to unleash the full extent of their somewhat unbalanced personalities in ways that are constructive.

Dragon Lords
The Dragon Lords are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in Imperial records. In 998.M41 all contact was lost with the Dragon Lords' Chapter planet, Erwynn's World. This bodes ill for the Dragon Lords until their ultimate fate can be determined.

Dragon Warriors
The Dragon Warriors are a warband of Chaos Space Marines dedicated to the Blood God Khorne who were originally Renegade Space Marines from the 6th Company of the Salamanders Chapter. Captain Terellus of the Salamanders' 6th Company led his warriors to betray the Chapter and the Emperor of Mankind and swear their loyalty instead to the Chaos God Khorne. The Dragon Warriors are specialists in short-range fire fights and melee combat, like all Khornate warbands. They also prefer the use of Melta and Flame Weapons.

Dusk Raiders
The Dusk Raiders were the XIV Space Marine Legion raised by the Emperor of Mankind on Terra at the dawn of the Great Crusade in the 31st Millennium. After the Emperor discovered the Dusk Raiders' Primarch Mortarion on the poisonous world of Barbarus, and gave him command of the XIV Legion, Mortarion changed the name of the Legion to the Death Guard after the name of the military force he had raised on his homeworld of Barbarus to overthrow the rule of that Feral World's necromantic warlords.

Eagle Warriors
The Eagle Warriors are a fleet-based Progenitor (Second Founding) Successor Chapter of the Ultramarines Legion. Since the Eagle Warriors are a fleet-based Chapter with no permanent homeworld on which to build their fortress-monastery, they are continually on campaign to defend those star systems originally conquered by Roboute Guilliman during the Great Crusade. Within the Mythos Angelica Mortis, the great work concerning the Space Marines of the latter part of the 37th Millennium, the Eagle Warriors are listed as the immediate forebears of the Marines Errant, although why they were singled out for the honour of a "named" Founding (23rd Founding) being drawn from their ranks at this time remains lost to posterity.

Ebon Knights
The Ebon Knights were a Loyalist Space Marine Chapter of unknown origin and Founding. Virtually nothing is known about this reclusive Chapter other than that they participated in the notable campaign upon the industrial world of Iriad IV, where they fought a brutal action against a warband of the the World Eaters Traitor Legion. The battle against these Khornate Berserkers resulted in the mutual destruction of both forces and the corruption of the Ebon Knights' sole survivor by the Blood God Khorne.

Emperor's Children
The Emperor's Children Traitor Legion is one of the First Founding Space Marine Legions that turned to Chaos during the Horus Heresy and later became Chaos Space Marines wholly devoted to the service of the Prince of Chaos, Slaanesh.

Emperor's Hands
The Emperor's Hands are a Codex Astartes-compliant Space Marine Chapter.

Emperor's Hawks
The Emperor's Hawks are a Codex Astartes-compliant Chapter of unknown origin and founding.

Emperor's Shadows
The Emperor's Shadows are a Successor Chapter created using the gene-seed of the Iron Hands.

Emperor's Spears
The Emperor's Spears are a Loyalist Space Marine Chapter of unknown origin and Founding.

Emperor's Swords
The Emperor's Swords are a Chapter of unknown founding and origin. The Chapter was decimated by the forces of the Alpha Legion after 300 standard years of infiltration and subversion. Another Chapter named the Emperor's Swords, which may or may not be the same group of Astartes, was wiped out in 970.M41 when a massive force of Necrons that had just awakened deep beneath their Chapter homeworld of Bellicas assaulted their fortress-monastery and slaughtered every last Emperor's Sword Space Marine over the course of a three-week-long siege.

Emperor's Warbringers
The Emperor's Warbringers are a Codex Astartes-compliant Space Marine Chapter of unknown origin or Founding who are a Successor Chapter of the Imperial Fists. This Chapter is known for sometimes making use of camouflage on their vehicles and their personal armour and possesses a reputation as especially brutal combatants against the foes of the Emperor.

Emperor's Wolves
The Emperor's Wolves are a Loyalist Space Marine Chapter of unknown origin and Founding whose gene-seed contain altered and integrated wolf genes similar to those found in the gene-seed of the Space Wolves, though any further connection between the Chapters remains unknown. The Emperor's Wolves lost their 8th Company in the Warp who reemerged decades later as the warband of Chaos Space Marines known as the Blood Disciples. Nothing else is known about the Chapter in Imperial records.

Emperor's Wrath
The Emperor's Wrath Space Marines Chapter is based in Segmentum Solar. They are a Loyalist Chapter of unknown origin and Founding. Their homeworld is in a star system where there are no planets, only asteroids. This system contains three asteroids that have been hollowed out and made into three massive hive cities. This is where the Chapter recruits new members. This Chapter has a deep hatred for xenos like the Tyranids and the Orks. The Emperor's Wrath has purged many Ork-held star systems using the Exterminatus. The Chapter has done the same on many worlds that have fallen to the various Tyranid Hive Fleets. Some of the worlds purged still had large numbers of Imperial forces on them. The Chapter Master and the First, Second and Third Company are currently on a crusade against the forces of Chaos who have occupied a portion of the world of Cadia following Abaddon's 13th Black Crusade against the Imperium.

Empyrion's Blight
Empyrion's Blight is a warband of Chaos Space Marines composed of Plague Marines drawn from the Death Guard Traitor Legion. Very little is known about this warband in Imperial records.

Espandors
The Espandors are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Excoriators
The Excoriators are a Codex Astartes-compliant Chapter of Space Marines who are a Second Founding Successor Chapter of the Imperial Fists. An ancient tome of knowledge known as the Mythos Angelica Mortis lists them as one of the twenty Chapters of Astartes founded to make up the Astartes Praeses, an ever-vigilant Space Marine task force assigned to guard the regions of the Imperium surrounding the Eye of Terror. The Excoriators' Chapter homeworld is Eschara in the Segmentum Obscurus.

Excubants
The Excubants are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Execrators
The Execrators are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Executioners
The Executioners were one of four formerly Loyalist Space Marine Chapters that rebelled against the Imperium of Man's authority during the Badab War. The Chapter was believed to have found itself on the wrong side of that conflict through little fault of its own, and was eventually permitted to continue in its service to the Imperium after a suitable penance. The Executioners were a 3rd Founding Successor Chapter of the Imperial Fists created according to Imperial records in the first year of the 32nd Millennium.

Exemplars
The Exemplars are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Exorcists
The Exorcists were created during the 13th Founding, the so-called "Dark Founding" which occurred sometime between the 35th and 36th Millennia, before the start of the Age of Apostasy. The Exorcists were founded as part of a highly-classified Imperial experiment to create Space Marines who were unusually resistant to daemonic possession and Chaotic corruption because as part of their initiation into the Chapter they had actually been forced to serve as daemonhosts for a short time before having the creature expelled back to the Warp by the intervention of an Inquisitor.

Exquisite Host
The Exquisite Host is a Chaos Space Marine warband in the service of Slaanesh. It is not known with any certainty, but they are most likely a warband from the Emperor's Children Traitor Legion. The Exquisite Host are known to employ an infamous battle formation known as the so-called Lament of the Damned - a terrifying onslaught of Chaos Sonic Dreadnoughts bound to the service of Slaanesh - outfitted with the same destructive and mind-blasting arcane sonic technology as the Noise Marines.

Exsanguinators
The Exsanguinators are a Loyalist Space Marine Successor Chapter of the Blood Angels, created during an unknown Founding. Almost nothing is known about this Chapter in Imperial records. Created as they were from the Blood Angels' gene-seed, they too, carry the genetic Flaws inherited from Sanguinius. Like many of their contemporary Successor Chapters founded in later centuries, the Exsanguinators were greatly affected by the Black Rage and like the Flesh Eaters, they too, are a shrinking Chapter as the Flaw begins to whittle down their numbers.

Extinction Angels
The Extinction Angels were one of the Successor Space Marine Chapters that turned to Chaos after the Horus Heresy. The Chapter is famous for its skill in launching planetary assaults.

Faithless
The Faithless are a large warband of Chaos Space Marines drawn from the Alpha Legion who operated off of the Chaos Battleship Anarchy's Heart. Formerly led by the Chaos Lord Arkos the Faithless, the warband is now believed to have been destroyed during the Siege of Vraks. Arkos himself is currently a prisoner of the Dark Angels Chapter of Space Marines.

Fire Angels
The Fire Angels are a Loyalist Space Marines Chapter created during the 25th Founding of the 40th Millennium from the gene-seed of the Ultramarines. The Fire Angels are best remembered in Imperial records for the role they placed in the recent Badab War, a rebellion by several Space Marine Chapters against the Imperium of Man.

Fire Claws
The Fire Claws were a Loyalist Space Marine Chapter raised in the 36th Millennium, though of an unknown origin and Founding. It is thought that the Fire Claws were Founded during the dark days of the Age of Apostasy, though Imperial records of events during that strife-torn period are notoriously ambiguous and difficult to uncover. They are believed by some to be a Successor Chapter of both the Ultramarines and the Dark Angels, as gene-seed from both Chapters was probably used in their Founding, though this remains unknown for certain. They were founded as one of the 20 Chapters of the Astartes Praeses, created by the Imperium of Man specifically to guard against the threat of the Traitor Legions attacking from the Eye of Terror. The Fire Claws were once counted amongst the most stalwart defenders of Mankind. The Fire Claws are listed in the annals of Imperial history on many occasions, and have taken part in many glorious victories. Not least amongst these conflicts were the Purging of the Cult of the Inner Eye, the First Siege of Cocalus, and the Albrecht IV Landings. They were also part of the relief force that made possible the evacuation of the millions-strong Crusade army of Warmaster Hendrik during his ill-fated expedition into the Wheel of Fire, far from the Eye of Terror. In the middle of the ninth century of the 41st Millennium, the Fire Claws were involved in a fateful mission aboard the Space Hulk designated the Captor of Sin. This Space Hulk contained a warband of Chaos Space Marines led by a Chaos Champion of Tzeentch known as the Excoriator. Following the events aboard the Captor of Sin, the Fire Claws became convinced that they could wield the weapons of Chaos against itself. The Fire Claws soon embarked on a Crusade to explore the worlds around the Eye of Terror to uncover more Chaotic relics. Over the decades that followed, many such artefacts were discovered and the Fire Claws Chapter became known instead as the Relictors. Eventually, their obsession with obtaining Chaos weaponry was discovered, and for their blasphemy, they were declared Excommunicate Traitoris by order of the Holy Ordos of the Inquisition.

Fire Hawks
The Fire Hawks are one of the Loyalist Space Marine Chapters created in the 36th Millennium during the Cursed 21st Founding. While the Fire Hawks have always maintained they were forged from the genestock of the Ultramarines, the sons of Roboute Guilliman have never acknowledged any kinship, fuelling suspicions as to their true heritage.They have the dubious distinction of being one of the few Chapters of the Adeptus Astartes to have lost not one but two Chapter homeworlds. After being nearly driven to extinction during the Badab War, the Fire Hawks' mobile fortress-monastery, the ancient Void Fortress Rapturous Rex and their entire Chapter fleet, was lost in the Warp in 963.M41. It is now believed that the survivors of this disaster became the cursed Astartes known collectively as the Legion of the Damned.

Fire Lords
The Fire Lords are a Codex Astartes-compliant Loyalist Space Marines Chapter. Their Founding date has not been officially established. There is no definite information on what Chapter's gene-seed was used in the Fire Lords' creation. There are several theories on the subject, though it is generally believed by most savants of the Administratum that the Imperial Fists are the true source of the Fire Lords' gene-seed. The Fire Lords' homeworld is the volcanic planet of Mundus Pyra.

Fire Reavers
The Fire Reavers are a fanatical warband of Chaos Space Marines that are highly devoted to the Ruinous Powers, willingly offering themselves up to the Chaos Gods for possession by immaterial beings. Members of the Fire Reavers henceforth, become Possessed Chaos Space Marines, which is viewed as a great honour within the warband.

Fists of Olchis
The Fists of Olchis were once a Loyalist Chapter of Space Marines of unknown origin and Founding. They were lost after entering the Eye of Terror in 321.M37 as part of the Imperial Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, and they were declared Perditas by the Imperial Inquisition, who feared that if the Chapter still existed, it had been corrupted by Chaos.

Flame Eagles
The Flame Eagles are a Loyalist, Codex Astartes-compliant Space Marine Chapter. It is suspected that they are one of the rare Successor Chapters of the Raven Guard. Their exact Founding date is unknown. Unfortunately, at this time almost nothing is currently known about the Chapter in Imperial records beyond their name and Chapter appearance.

Flame Falcons
The Flame Falcons were one of the cursed Space Marine Chapters created during the Cursed 21st Founding. Although their earlier successes promised a great future for the Chapter, they were almost completely wiped out by the Inquisition before a hundred years had passed following their Founding. The cause of the Inquisition's attack was that during an engagement, members of the Chapter had burst into flame. These Astartes came to no harm, and believed the flames to be a gift from the Emperor of Mankind, so they fought with a fierce savagery that won the day. The members of the Inquisition did not share the Chapter's belief that they had been blessed by the Emperor, and when the Chapter returned to their homeworld of Lethe to celebrate their victory, they were attacked and almost completely destroyed by a force of Grey Knights who believed them to have been possessed by daemons.

Flawless Host
The Flawless Host is a Chaos Space Marine warband, believed to be a splinter group of the Emperor's Children Traitor Legion (or at least a warband utilizing their gene-seed).

Flesh Eaters
The Flesh Eaters are an infamous Loyalist Successor Chapter of the Blood Angels Legion created during the Third Founding in the 32nd Millennium. This ruthless Chapter's unsavoury reputation is infamous across the Imperium of Man, as are the bloody deeds purported to have been enacted by its Battle-Brothers upon the fields of battle. So divorced have the Flesh Eaters become from the rest of Mankind that most Imperial Commanders embrace the Chapter's offers of assistance only in the direst of circumstances.

Flesh Tearers
The Flesh Tearers are the smallest Second Founding Successor Chapter of the Blood Angels, numbering only four full companies of Astartes. They are Loyalists of the Emperor of Mankind though their heavy affliction with the Flaws of their Primarch Sanguinius has led to their investigation on charges of heresy by the Inquisition. They have been cleared of suspicion at present. Like their progenitors, the Flesh Tearers are known for their bloodthirsty nature in battle, bad temper and feared for the Flaws like the Black Rage and the Red Thirst that they carry within their gene-seed.

Flylords, The
The Flylords are a warband of Chaos Space Marines. They were once a Loyalist Chapter of Space Marines of unknown origin and Founding, known as the Vengeance Chapter. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Imperial Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, but by the time they made their way back into realspace, they had become the warband of Chaos Space Marines known as The Flylords.

Foresworn (Word Bearers)
The Foresworn are a warband of Chaos Space Marines drawn from the Word Bearers Traitor Legion.

Foresworn (World Eaters)
The Foresworn are a large warband of Khornate Berserkers drawn from the World Eaters Traitor Legion that followed the infamous Chaos Lord Kossolax the Foresworn.

Fractured
The Fractured are a warband of Chaos Space Marines. They were once a Loyalist Chapter of Space Marines of unknown origin and Founding, known as the Justicars. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Imperial Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, but by the time the Justicars made their way back into realspace, they had become the warband of Chaos Space Marines known as The Fractured.

Genesis Chapter
The Genesis Chapter is a Second Founding Successor or Primogenitor Space Marines Chapter of the legendary Ultramarines. The Chapter's homeworld is the planet Newfound which is located a comparatively short distance to the galactic northwest of the Ultramarines' Realm of Ultramar, and its Astartes commonly undertake at least one pilgrimage to the Shrine of the Primarch on Macragge. First amongst the Ultramarines' Primogenitor Chapters to be raised (and hence their name), the Genesis Chapter are dogmatically loyal to the Imperium of Man and the memory of their Primarch Roboute Guilliman, and can be counted upon to fight at the Ultramarines' side without hesitation.

Gladiator Group 138
Gladiator Group 138 is a large warband of Chaos Space Marines drawn from the World Eaters Traitor Legion.

Golden Gryphons
The Golden Gryphons are a Loyalist Chapter of Codex Astartes-compliant Space Marines of unknown Founding and origin. Nothing else is known about them in Imperial records.

Golden Halos
The Golden Halos are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records other than that they were engaged in such notable campaigns as: Kistvaen, Podzul, and the decades-long Siege of Nectocalyx, which was colloquially referred to as "The Meatgrinder."

Grey Death
The Grey Death are a Renegade Chapter of Chaos Space Marines that are sworn to the service of Nurgle. They were once a Loyalist Chapter of Space Marines known as the Iron Drakes. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Imperial Abyssal Crusade. At some point during their sojourn in the Eye, the Iron Drakes were corrupted by Nurgle on the Daemon World of Anathrax and became the Grey Death, ready and willing to spread their plague across the stars.

Grey Knights
The secret Grey Knights Chapter acts as the Chamber Militant of the Ordo Malleus, the daemon-hunting branch of the Imperial Inquisition. Their fortress-monastery is located on Titan, the largest moon of the gas giant Saturn, which is located in the sacred Sol System. Every Grey Knight Astartes is also a psyker, which makes it all the more remarkable that no Grey Knight has ever turned to Chaos. The existence of the Grey Knights is one of the most closely-held secrets in the Imperium, including from the other Chapters of the Adeptus Astartes.

Grey Slayers
The Grey Slayers are a Loyalist Space Marines Chapter of unknown origin and Founding that became corrupted by Chaos. Inquisitor Thrax purged the Chapter of mutants and daemons, and the Chapter Master took his own life in shame. Untainted officers were raised up to lead the Chapter. The purge was apparently not quite thorough enough, as Inquisitor Thrax himself was soon afterwards corrupted by the Ruinous Powers and transformed into some sort of daemonic Chaos beast. The Grey Slayers' eventual disposition and fate remains unknown in current Imperial records.

Grief Bringers
The Grief Bringers are a Loyalist Space Marine Chapter of unknown origins and Founding that suffered heavy losses fighting against the Warp entities called Enslavers on the world of Valhall II. Their armour is described as "principally a sickly pea-green, with engrailed chevrons of headachey purple."

Guardians of the Covenant
The Guardians of the Covenant is a Successor Chapter of the Dark Angels, of an unknown Founding. This Chapter is dedicated to the scholarly arts as to the ways of war. Masters of both, the Battle-Brothers of this Chapter use their keen intellects as a weapon as sharp as their Chainswords. The Chapter's Astartes study the teachings of the Emperor and of their Primarch Lion El'Jonson in minute detail, attaining a unique perspective on the object of their diligent studies. Every shred of ancient wisdom is absorbed, debated and analysed, so that no ruse or stratagem is beyond the Guardians of the Covenant, and none may better them on the field of battle.

Hakanor's Reavers
Hakanor's Reavers are a warband of Chaos Space Marines of unknown origin and allegiance. They are led by the mighty Daemon Prince Hakanor who was formerly known as the Chapter Master Prometian. The Power Armour of these warriors now blazes with a heat that would melt its Ceramite plates if it was not sorcerous in nature. The plates now constantly crack and then cool and reform as a result of this constant heat.

Halo Dragons
The Halo Dragons are a Loyalist Space Marine Chapter of unknown origins and Founding who played an instrumental role in containing the Tau's Third Sphere Expansion during the Zeist Campaign of 999.M41. Little else is known about them in Imperial records.

Hammers of Dorn
The Hammers of Dorn are a Loyalist Space Marine Chapter and a Successor Chapter of the Imperial Fists.

Hammers of Retribution
The Hammers of Retribution are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in Imperial records.

Hawk Lords
The Hawk Lords are a Codex Astartes-compliant Chapter of of unknown origin and Founding who may be a rare Successor Chapter of the Raven Guard, though this allegation remains unconfirmed. The Hawk Lords almost never use Drop Pods in their planetary assaults, preferring to make use of their Thunderhawk gunships for low-altitude insertions instead because of the greater control the use of those aircraft allows in making deployments. So skilled are they in the use of such tactics that the Astartes pilots of other Loyalist Chapters have been known to spend time as pilots in one of the Hawk Lords' Talon Wings to gain the aeronautical skills displayed by the Hawk Lords.

Heralds of Ultramar
The Heralds of Ultramar are a Codex Astartes-compliant Chapter derived from the Ultramarines gene-seed. Their exact Founding date is unknown.

Heralds of Vengeance
The Heralds of Vengeance are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in Imperial records.

Honoured Sons
The Honoured Sons are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records except for the name of their homeworld of Jonol, located in the Eastern Fringes of the Segmentum Ultima.

Hospitallers
The Hospitallers are a non-Codex Astartes-compliant Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in current Imperial records.

Hounds of Demos
The Hounds of Demos are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Howling Griffons
The Howling Griffons are a Loyalist Space Marines Chapter Founded in the 33rd Millennium from the gene-seed of the Ultramarines who fought in the Badab War and saw extensive action in the 13th Black Crusade, fighting against Chaos Plague Marines in the defence of the world of Amistel Majoris.

Iconoclasts
The Iconoclasts are a warband of Chaos Space Marines. They were once a Loyalist Chapter of Space Marines of unknown origin and Founding, known as the Altar Brethren. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Imperial Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, but by the time they made their way back into realspace, they had become the warband of Chaos Space Marines known as the Iconoclasts.

Immortal Hearts
The Immortal Hearts are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in Imperial records.

Imperial Castellans
The Imperial Castellans are a Codex Astartes-compliant Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is currently known about this Chapter in Imperial records.

Imperial Fists
The Imperial Fists are one of the First Founding Chapters of the Space Marines and were originally the VII Legion of Astartes raised by the Emperor Himself. During the Great Crusade the Imperial Fists functioned as the Emperor's "personal praetorians," accompanying him everywhere. The Imperial Fists were usually used to strike a decisive blow against the enemies he confronted during that time. The role of the Emperor's bodyguard since he was mortally wounded during the Horus Heresy and interred within the Golden Throne at the heart of the Imperial Palace on Terra has been entirely taken over by the Adeptus Custodes.

Imperial Harbingers
The Imperial Harbingers are a Loyalists Space Marine Chapter of unknown origin whose Founding occurred during the 23rd Founding in the 37th Millennium. This Chapter hails from the world of Birmingham, "the Black Planet," so named because it receives very little visible light. The Imperial Harbingers are specialists at drop assaults.

Imperial Hawks
The Imperial Hawks are a Loyalist Space Marine Chapter of unknown origin and Founding. They specialise in fast attacks from the air, utilising high-altitude Jump Pack-assisted assaults, followed by reinforcement sorties from squadron-strength units of Land Speeders, often dropped at altitude and at high-speed from Thunderhawk gunships. Almost nothing else is known about the Chapter in Imperial records.

Imperial Heralds
The Imperial Heralds were the XVII Space Marine Legion raised by the Emperor of Mankind on Terra at the dawn of the Great Crusade in the late 30th Millennium. After the Emperor discovered the Legion's Primarch Lorgar on the Feudal World of Colchis, and gave him command of the Imperial Heralds, Lorgar changed the name of the Legion to the Word Bearers, fervently believing that the Emperor of Mankind was the divine saviour of humanity. In the early years of the Great Crusade, the World Bearers spread their faith in the God-Emperor to every world in the Imperium, despite the Emperor's continuing admonishments that his Imperium was to be built on the foundation of the Imperial Truth, an atheistic, rationalist doctrine that forbade the practice of religious faith as mere superstition. The Word Bearers would eventually be the first Space Marine Legion to be corrupted by the Ruinous Powers of Chaos many decades before their counterparts turned to the Dark Gods and through their actions they corrupted the Warmaster Horus and brought on the terrible civil war known as the Horus Heresy in all its savagery.

Imperial Paladins
The Imperial Paladins are a Loyalist Codex Astartes-compliant Space Marine Chapter of unknown origin and Founding. Unfortunately nothing more is currently known about them in Imperial records.

Imperial Ravagers
The Imperial Ravagers are a little known Loyalist Space Marine Chapter. Their fortress-monastery is a space station that orbits the world of Vindict V. They were summoned to perform Exterminatus upon the Genestealer-infested planet of Stalinvast in The Inquisition War trilogy novel Draco by Ian Watson.

Imperial Stars
The Imperial Stars are a Codex Astartes-compliant Space Marine Chapter. There have been suspicions of Chaotic taint among the Imperial Stars. A team from the Inquisition's Ordo Hereticus has been sent to assess the extent of the threat, if any. Nothing else is known about the Chapter in current Imperial records.

Imperial Talons
The Imperial Talons are a Loyalist, Codex Astartes-compliant Space Marine Chapter. It is suspected that they are one of the rare Successor Chapters of the Raven Guard. Their exact Founding date is unknown. Unfortunately, at this time almost nothing is currently known about the Chapter in Imperial records beyond their name and Chapter appearance.

Inceptors
The Inceptors are a Loyalist Codex Astartes-compliant Space Marine Chapter. They are a Second Founding Successor Chapter of the Ultramarines Legion. Little is known of this Chapter's history within the Imperial archives, except there involvement in a regrettable incident during the Macharian Heresy in the early years of the 41st Millennium.

Inculcators
The Inculcators are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Interceptors
The Interceptors are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in Imperial records.

Invaders
The Invaders are a Loyalist Codex Astartes-compliant Space Marines Chapter of unknown Founding and origin. Their Chapter homeworld of Ogrys was lost to an assault by the Eldar of Craftworld Alaitoc approximately a standard century ago and the Invaders have been forced to become a Fleet-based Chapter while they rebuild their strength from the heavy losses they suffered against the vengeful xenos.

Invictors
The Invictors were a formerly Loyalist Space Marine Chapter of unknown Founding and origin. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Imperial Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, but by the time they made their way back into realspace, they had become a Chaos Space Marine warband known as The Unhallowed.

Inviolators
The Inviolators are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Invocators
The Invocators are a warband of Chaos Space Marines. They were once a Loyalist Chapter of Space Marines of unknown origin and Founding, known as the Clerics of Steel. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Imperial Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, but by the time they made their way back into realspace, they had become the warband of Chaos Space Marines known as the Invocators.

Iron Champions
The Iron Champions are a Space Marine Chapter that is a Successor Chapter of the brutal Executioners for their role in combating the apostates and traitors of the Plague of Unbelief in the 36th Millennium. The Executioners were granted the rare honour of having a new Chapter, the Iron Champions, being created from their gene-seed in a later Founding.

Iron Crusaders
The Iron Crusaders are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in Imperial records. The Iron Crusaders were last seen in 998.M41 heading towards the forbidden region of space known as the Ghoul Stars.

Iron Fists
The Iron Fists are a Codex Astartes-compliant Loyalist Chapter who are a Successor Chapter of the Imperial Fists. they were formed in the 37th Millennium during the 22nd Founding.

Iron Hands
The Iron Hands are a Loyalist Space Marines Chapter and one of the original First Founding Space Marine Legions created from the gene-seed of their martyred Primarch, Ferrus Manus. Originally founded as the X Legion, they took part in numerous Imperial Compliances during the Great Crusade. When the Horus Heresy erupted, they were nearly annihilated during the Drop Site Massacre of Istvaan V and their Primarch was slain by the traitorous Fulgrim, Primarch of the Emperor's Children. Since that time, the Iron Hands have grown to believe that human flesh is weak and easily corruptible, and strive to replace their organic bodies with more "pure" bionic substitutes, thus closely emulating the faith of the Adeptus Mechanicus' Cult of the Machine.

Iron Hearts
The Iron Hearts were briefly mentioned in the short story "Hell in a Bottle" by Simon Jowett published in the anthology Into the Maelstrom. Their Primarch is mentioned as "Primarch Rubineck," possibly one of the unknown Primarchs listed in several Space Marine codexes. The removal of this Chapter's name may be the result of the content of the short story where at its end a Chaos Daemon Lord gains entrance to the Chapter's training centre via the body of a failed Space Marine. Further canon disregards the use of the name of the Primarch and goes on to state that the Chapter was all but annihilated fighting the Daemon Lord who manifested in their star system. Only two companies, the Sixth and Tenth, remain at full strength.

Iron Knights
The Iron Knights are a Second Founding Successor Chapter of the Imperial Fists. The Iron Knights were one of the many Loyalist Space Marine Chapters who participated in the defence of Cadia from Abaddon the Despoiler's offensive during the Thirteenth Black Crusade.

Iron Lords
The Iron Lords are a Loyalist, Codex Astartes-compliant Space Marine Chapter of unknown origin and Founding who have played major roles in combating the Barghesi, the Tyranids and the Tau.

Iron Shield
The Iron Shield is a Loyalist Space Marine Chapter of unknown Founding and origin. Much of this Chapter's history has been lost and is not recorded in Imperial records.

Iron Snakes
The Iron Snakes are a Second Founding Loyalist Space Marine Chapter of unknown origin who may possibly be a Primogenitor Chapter of the Ultramarines, though they are not a Codex Astartes-compliant Chapter. The Iron Snakes take their name from the giant sea serpents called Water Wyrms that inhabit their homeworld of Ithaka's vast oceans. The Iron Snakes Chapter's primary task is to guard a cluster of Imperial solar systems known as the Reef Stars close to their homeworld of Ithaka, which are infrequently plagued by Orks, and more frequently by the Dark Eldar. The Iron Snakes were one of the many Space Marine Chapters who participated in the defense against the Forces of Chaos during the 13th Black Crusade.

Iron Talons
The Iron Talons are one of the Loyalist Space Marine Chapters Founded as part of the Astartes Praeses - one of the 20 Chapters of Astartes mentioned in the ancient tome known as the Mythos Angelica Mortis that was created to defend the regions surrounding the Eye of Terror in the Segmentum Obscurus from the Forces of Chaos. The Iron Talons were Founded using White Scars gene-stock during an unknown Founding.

Iron Warriors
The Iron Warriors were a First Founding Space Marine Legion that turned Traitor, pledged themselves to Chaos Undivided and fought against the Imperium during the Horus Heresy. The Iron Warriors were originally the IV Space Marine Legion, specialising in the breaking of sieges and assaults on static fortifications, which made them great rivals of the Imperial Fists Legion, which was said to construct the greatest static defences in the Imperium. It was this rivalry between the Legions, and between their Primarchs Perturabo and the Imperial Fists' Rogal Dorn, that helped turn the Iron Warriors to Chaos. Like the members of the Adeptus Mechanicus and the Loyalist Iron Hands Chapter, the Iron Warriors have a strong predilection for replacing parts of their body with cybernetic enhancements. When struck with a mutational "gift" from the Ruinous Powers, most Iron Warriors simply cut off the mutated appendage, if possible, and replace it with a mechanical one.

J
No known Chapters' names begin with the letter "J."

Knights of Blood
The Knights of Blood are a currently Renegade Space Marines Chapter who were declared Renegades and Excommunicate Traitoris by the High Lords of Terra on the advice of the Inquisition because of the terrible destruction they wrought against friends and foes alike, yet the Knights of Blood still consider themselves to be loyal to the Emperor of Mankind, if not to his Imperium. The Knights of Blood are a Successor Chapter of the Blood Angels, created during an unknown Founding.

Knights of Blood (Warband)
The Knights of Blood are a warband of frenzied Chaos Space Marines of unknown origin who are most likely servants of the Blood God Khorne. They have been responsible for numerous massacres of Imperial populations including the ones carried out on the worlds of Cadon, Helka II, Obsus Prima and most recently on Ornsworld.

Knights of Dorn
The Knights of Dorn are a Codex Astartes-compliant Loyalist Space Marine Chapter of unknown Founding. They were created from the gene-seed of the Imperial Fists. Almost nothing is known about this Chapter in current Imperial records.

Knights of Eternity
The Knights of Eternity are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in Imperial records. In 990.M41, Hive Fleet Kraken attacked across a large front of Imperial space that covered many thousands of light years. Several Space Marine Chapters dedicated their forces to saving the worlds that other Imperial armies had abandoned. The Knights of Eternity were one of those Chapters, selling their lives dearly in the defence of the Imperium against the predations of the Great Devourer. They are presumed to have been completely obliterated.

Knights of Gryphonne
The Knights of Gryphonne were a Codex Astartes-compliant Chapter of unknown origin and founding date.

Knights of the Raven
The Knights of the Raven are a Codex Astartes-compliant Space Marine Chapter of unknown Founding date. Very few details of the Knights of the Raven Chapter are known, even within the ranks of the Adeptus Astartes, the Deathwatch, and the Ordos of the Inquisition. Given the similarities between the Chapter's iconography and that of the Raven Guard Chapter, it might be assumed that the Knights of the Raven are related in some way to the First Founding sons of the Primarch Corvus Corax, though there is no definitive link between the two Chapters beyond the coincidence of name and heraldry. The Chapter's homeworld is the planet Coralax.

Knights Sanguine
The Knights Sanguine are a Loyalist Space Marine Successor Chapter of the Blood Angels, created during an unknown Founding. Almost nothing is known about this Chapter in Imperial records. Created as they were from the Blood Angels' gene-seed, they too, carry the heirs of Sanguinius' genetic Flaws, the Red Thirst and the Black Rage. Like many of their contemporary Blood Angels Successor Chapters founded in later centuries, the Knights Sanguine were greatly affected by the Flaw and their numbers were increasingly consumed by the Black Rage.

Knights Unyielding
The Knights Unyielding is one of the Loyalist Space Marine Chapters Founded as part of the Astartes Praeses - one of the 20 Chapters of Astartes mentioned in the ancient tome known as the Mythos Angelica Mortis that was created to defend the regions surrounding the Eye of Terror in the Segmentum Obscurus from the Forces of Chaos. The Knights Unyielding are of an unknown Founding and origin.

Lamenters
The Lamenters are an unfortunate Loyalist Space Marine [Chapter]] who perhaps more than any other Chapter of the present era seem to have been cursed by a dark shadow that has long determined their fate. The Lamenters' accursed and haunted legacy seems to have tainted much of what they have achieved and their victories often become bitter ashes in their hands. They found themselves on the wrong side during the Badab War and were thereafter devastated by the Tyranids. The Lamenters are a Successor Chapter of the Blood Angels created during the Cursed 21st Founding, and seem to have eliminated the gene-seed Flaws known as the Black Rage and the Red Thirst through unknown means, but this secret cure may have been lost along with the Chapter at the hands of the Great Devourer.

Legion of Night
The Legion of Night are a Loyalist Codex Astartes-compliant Space Marine Chapter of unknown origin and Founding. This Chapter hails from the world of Outrenacht. The only thing known with any certainty about these Astartes is that the Legion of Night's combat doctrine revolves around the use of Tactical Squads that utilise the Chapter's large pool of armoured transports. These are used to perform surgical strikes or seize strategic points with the aid of fast-moving Razorbacks or Rhinos. Like their fellow Chapters the Angels of Fury and the Raven Guard, the Legion of Night has forged their combat doctrine around such highly mobile insurgent tactics.

Legion of the Damned
The Legion of the Damned are the most famous of the Chapters of the Cursed 21st Founding and were once known as the Fire Hawks. The Fire Hawks were listed as officially destroyed as a Chapter in Imperial records even though some of their members sometimes appear on Imperial battlefields as the Legion of the Dead when the situation for other Imperial forces is dire, and their intervention turns the tide of battle. Many claim to have seen these living spectres in battle, but no thanks can ever be given to them, for they leave as suddenly and as quickly as they appeared. See also Fire Hawks.

Libators
The Libators are a Loyalist Space Marine Chapter who are a Second Founding Successor Chapter of the Ultramarines. Nothing else is currently known about them in the Imperial record.

Liberators
The Liberators are a Loyalist Space Marines Chapter of the Imperium of Man and a Second Founding Successor Chapter of the Ultramarines. Their one peculiarity compared to most other fully Codex Astartes-compliant Space Marine Chapters is that their basic weapon for Tactical Marines of the Chapter is the Storm Bolter. Other than this, very little is currently known about the Liberators in Imperial records.

Lion Warriors
The Lion Warriors are a Codex Astartes-compliant Space Marine Chapter of unknown origin.

Lions Defiant
The Lions Defiant are a Loyalist Codex Astartes-compliant Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in Imperial records. In 992.999.M41, a massive event known as the Night of a Thousand Rebellions occurred. Uprisings and discord struck countless planets across the Imperium. Unrest raced like wildfire, consuming many outlying planets, but also supposedly secure worlds like Enceladus, Darkhold, and Minisotira. Contact is lost with large swathes of the Segmentum Pacificus. Even the homeworld of the Lions Defiant Space Marine Chapter was lost to the anarchy caused by the coordinated activity of secret Chaos Cults and frenetic agitators.

Lord Skchalick's Elite
Lord Skchalick's Elite is a warband of Chaos Space Marines drawn from the World Eaters Traitor Legion that follow the infamous Chaos Lord Skchalick. They are notable for taking part in the First War for Armageddon.

Lords of Decay
The Lords of Decay are a warband of Chaos Space Marines originally drawn from the Death Guard Traitor Legion though they have grown large by recruiting members of the other Traitor Legions and Renegade Space Marine Chapters dedicated to Nurgle who have deemed their commanders' attitude towards the Imperium of Man in general and the defence of Terra in particular to be too fearful. The Lords of Decay are known to have been led for a time by the Daemon Primarch Mortarion himself. The Lords of Decay are known to be the only Chaos Space Marine warband in existence to have attempted a direct attack on the Solar System and to have ever defeated a member of the Adeptus Custodes in combat since the Horus Heresy. They were also heavily involved in assisting the Forces of Chaos during the terrible Siege of Vraks. The Lords of Decay are primarily composed of Plague Marines.

Lords of Wrath
The Lords of Wrath are a Loyalist Space Marine Chapter of unknown origin and Founding. Almost nothing about them is known in Imperial records. The Lords of Wrath are recorded in Imperial records as having participated in the capture of Decius Mus, the Arch-Heretic of Auscum, with assistance from the 23rd Bruttiam Regiment of the Imperial Guard.

Magma Hounds
The Magma Hounds are a warband of Chaos Space Marines. They were once a Loyalist Chapter of Space Marines of unknown origin and Founding, known as the Knights Excelsior. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Imperial Abyssal Crusade. During their sojourn into the Eye, the Knights Excelsior found themselves on the Dark Forge World of Temporia, home of the vile Warpsmith Valadrak. While investigating the strange mechanically-constructed world composed of endless manufactoria and machines, they were attacked by strange living Daemon Engines. Outgunned, the Knights Excelsior were forced to make a hasty tactical withdrawal, fighting their way back to their dropships. As they attempted to make good their escape, their vessels were attacked by a strange archeotech device that rendered their technology impotent, leaving the Space Marines at the mercy of Temporia's Daemon Engines. When they were last seen, they had been refashioned into the Renegade Magma Hounds.

Malefactors
The Malefactors are a warband of Chaos Space Marines. They were once a Loyalist Chapter of Space Marines of unknown origin and Founding, known as the Sigilites. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Imperial Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, but by the time they made their way back into realspace, they had become the warband of Chaos Space Marines known as the Malefactors.

Malevolent
The Malevolent are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Mantis Warriors (Mantis Legion)
Sometimes referred to as the Mantis Legion in older texts, the Mantis Warriors was one of the three Astartes Chapters that joined the Astral Claws in rebelling during the Badab War. For their sins, they have been required to give up their homeworld and pursue the Emperor's forgiveness by defending the Imperium from their fleet without recruiting new members until their penance has been earned and their disgrace erased. This restriction was raised after the Mantis Warriors proved critical in throwing back the attach of a Tyranid splinter Hive Fleet from the strategically-placed Imperial world of Herodian IV

Marauders
The Marauders are a Loyalist Space Marines Chapter and a Second Founding Successor Chapter of the White Scars according to the Apocrypha of Davio, written in the 33rd Millennium. Little else is known about them in Imperial records save that the Mantis Warriors Chapter, which grew infamous during the Badab War, was created from the gene-seed of the Marauders.

Marines Errant
The Marines Errant are a Loyalist, fleet-based Space Marine Chapter of unknown origin created late during the 23rd Founding in the 37th Millennium, to repair the gap left in Imperial military forces by the loss of other Chapters. Further details of this Chapter's origins can be found in the Mythos Angelica Mortis, the great work concerning the Space Marines of this age, which lists five such new-founded Crusade Chapters and their blood-progenitors, with the Marines Errant recorded as having the Eagle Warriors Chapter as their immediate forebears. The Eagle Warriors' gene-seed was drawn from the Ultramarines' lineage, although why the Eagle Warriors in particular were singled out for the honour of a "named" Founding being drawn from their ranks at this time remains lost to posterity.

Marines Errantor
The Marines Errantor are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Marines Exemplar
The Marines Exemplar are one of the Chapters founded to make up the Astartes Praeses, the twenty Chapters created to guard the regions surrounding the Eye of Terror.

Marines Malevolent
The Marines Malevolent Chapter was founded in the 32nd Millennium and are of unknown genetic origin. While loyal to the Emperor of Mankind and deeply dedicated to the eradication of all of the Imperium's enemies, they have at times shown a disturbing and callous disregard for the lives of the civilians of the Imperium as long as their mission objectives are obtained, which has brought them into conflict with the Salamanders Chapter as well as many other Imperial organisations, including the Inquisition. The Marines Malevolent take a flippant view in regards to collateral damage and the use of excessive force. If innocent civilians or other Imperial forces happen to die due to their brutal tactics, then so much the better. This Chapter believes there is no such thing as "innocence," simply varying degrees of guilt, and that people who will not fight to defend themselves have no right to live as their freedom was purchased with the blood of others more worthy of the Emperor's blessings.

Marines Vindicant
The Marines Vindicant are a Loyalist Space Marine Chapter of unknown origin and Founding. Almost nothing else is known about the Chapter in Imperial records save that they played a major role in the scouring of the world of Vorlinghast in 981.M41, which had been overrun by Plague Zombies and the Death Guard Traitor Legion.

Masters of Protelus
The Masters of Protelus are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about the Masters of Protelus Chapter in current Imperial records.

Mentors
The Mentors, sometimes referred to in Imperial records as the Mentor Legion, are a Loyalist Codex Astartes-compliant Space Marine Chapter of unknown origin created during the 26th Founding in 738.M41, making them one of the most recently Founded Chapters in the Imperium of Man. Little is known about this Chapter in Imperial records, though the Mentors are known to be a reclusive and suspicious Chapter of Astartes who no longer trust other Space Marine Chapters or the Imperial government, preferring to work alone and unobserved by all save the foes of Mankind and the Emperor.

Metamarines
The Metamarines are a Loyalist Space Marine Successor Chapter of the Ultramarines created during an unknown Founding. The most renowned action of the Metamarines was their participation in the 13th Black Crusade in 999.M41, where they aided other Imperial forces in the defence against Abaddon the Despoiler and the Forces of Chaos unleashed upon the world of Cadia and its surrounding sectors.

Minotaurs
That there existed a Loyalist Space Marine Chapter called the Minotaurs, created during the Cursed 21st Founding of the 36th Millennium, is not widely contested in the Imperial record, but whether or not they are the same as the Chapter bearing the name that took part in the suppression of the Macharian Heresy in the opening decades of the 41st Millennium (and the same Chapter that would later go on to play a crucial and bloody role in the Badab War) is not so certain. The Minotaurs possess a reputation for being unusually xenophobic Astartes, even for the Imperium, as well as often unreliable combatants who do not work well with other Imperial military units.

Mortifactors
The Mortifactors are a Loyalist, Codex Astartes-compliant Second Founding Successor Chapter of Space Marines founded during the 31st Millennium from Ultramarines gene-seed, making them one of the Ultramarines' Primogenitor Chapters. The Mortifactors recruit from the austere Feral World of Posul, where the sun never rises on its frigid plains and its population of nomadic tribes are constantly in conflict with one another and practice cannibalism. The Mortifactors' Neophytes are chosen from the most vicious and skilled warriors on the planet -- who subsequently have a very morbid and dark outlook on life.

The Nameless
The Nameless are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in Imperial records.

Nemesis
The Nemesis Chapter is a Loyalist Codex Astartes-compliant Space Marine Chapter. They are a Second Founding Successor Chapter of the Ultramarines Legion. Little is known of this Chapter's history within the Imperial archives.

Night Hawks
The Night Hawks are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in Imperial records, other than their participation in the Angarius Incursion in the late 41st Millennium.

Night Reapers
The Night Reapers were a former Loyalist Space Marine Chapter that fell to the corruption of the Ruinous Powers and were eventually declared Excommunicate Traitoris, becoming a Renegade Chapter of Chaos Space Marines. The Night Reapers Chapter was eventually hunted down by the combined Imperial forces of the Grey Knights, Red Templars and Minotaurs Space Marines aboard the ancient pre-human Space Hulk designated the Perun Cross.

Night Stalkers
The Night Stalkers are a warband of Chaos Space Marines of unknown origin and allegiance. These shadowy warriors hail from the lightless, daemon-infested night world of Cthonis Ultra. They are masters of ambush, often seeming to appear from nowhere when confronting their foes.

Night Watch
The Night Watch is one of the Chapters founded to make up the Astartes Praeses, the twenty Chapters created to specifically guard the regions of the Imperium surrounding the Eye of Terror.

Nightkillers
The Nightkillers are a warband of Chaos Space Marines of unknown origin or allegiance.

Novamarines
The Novamarines are a Second Founding Successor Chapter of the Ultramarines. The Novamarines are scattered throughout the galaxy, and have not fought together as a Chapter since the early years of the 37th Millennium.

Oblators
The Oblators are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Omega Marines
The Omega Marines are a Loyalist Space Marine Chapter of unknown origin or Founding raised sometime during the 40th Millennium.

Oracles of Change
The Oracles of Change is a warband of Chaos Space Marines drawn from an unknown Chapter and dedicated to the service of Tzeentch. The Oracles are lead by the Chaos Sorcerer Amadeus Volkstein, who was once a Loyalist Librarian Epistolary before being corrupted by the promise of knowledge and power offered by the Lord of Change.

Panthers
The Panthers are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Patriarchs of Ulixis
The Patriarchs of Ulixis are a Loyalist Codex Astartes-compliant Space Marine Chapter. They are a Second Founding Successor Chapter of the Ultramarines Legion. Little is known of this Chapter's history within the Imperial archives.

Penitents
The Penitents are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Persecutors of Darkness
The Persecutors of Darkness are a Successor Chapter of the original Dark Angels Space Marine Legion. Almost nothing is known about the Persecutors of Darkness in Imperial records save that they exist and that they too are numbered amongst the ranks of the Unforgiven.

Praetors of Orpheus
The Praetors of Orpheus is a Second Founding Successor Chapter of the Ultramarines.

Predator Legion
The Predator Legion are a warband of Chaos Space Marines. They were once a Loyalist Chapter of Space Marines of unknown origin and Founding, known as the Serpents of Light. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Imperial Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, but by the time they made their way back into realspace, they had become the warband of Chaos Space Marines known as the Predator Legion.

Prodigal Sons
The Prodigal Sons are a warband of Chaos Space Marines dedicated to the service of Tzeentch, the Changer of Ways. The members of this warband are composed of a cabal of powerful Chaos Sorcerers who have chosen to follow the former Thousand Sons Chief Librarian Ahriman in exile out of their desire to seek out knowledge of Tzeentch and to potentially gain some of his power for themselves. They are notable for attempting to help their Sorcerer Lord to gain access to the Eldar Webway to find the fabled Black Library of Chaos.

Prophets of Mercury
The Prophets of Mercury were once a Loyalist Chapter of Space Marines of unknown origin and Founding. They were lost after entering the Eye of Terror in 321.M37 as part of the Imperial Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, though they were declared Martyr Extremis by the Imperial Inquisition, considered to have been wiped out by the Forces of Chaos.

Punishers
The Punishers are a Chaos Space Marine warband of unknown origin. There is little else known about them in Imperial records.

Purgators
The Purgators are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

The Purge
The Purge is a Chaos Space Marine warband dedicated to the Chaos God Nurgle, the Plague Lord. They despise life in all its forms and have waged war against aliens and Mankind alike across the 3000 standard years since their founding in the 38th Millennium, though their origin remains unknown. They aim to exterminate all known life in the galaxy in service to Nurgle in his aspect as the Lord of Death. When The Purge attack a world, famine, pestilence and death soon follow. They are infamous for their conduct of genocidal campaigns and the indiscriminate use of chemical weapons on civilian and military targets alike. They recently played a major role in defending the other Forces of Chaos during the Siege of Vraks by the Imperial Guard. Their current location is unknown.

Purple Stars
The Purple Stars are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in Imperial records. They are rumoured to have close ties with the Adeptus Mechanicus and the Inquisition. Sometime during the 32nd Millennium, at the behest of Technomagos Ipsissimus and an unidentified emissary of the Inquisitorial Representative of the High Lords of Terra, the Purple Stars sent Epistolary Merchstrumer and half a squad of Battle-Brothers (5 Astartes) into the Eye of Terror to carry out a clandestine reconnaissance mission. But their presence did not go unnoticed for long, and soon the Purple Stars found their null ship being boarded by a large force of Chaos Space Marines. Severely outnumbered and running low on ammunition, the Purple Stars prepared to sell their lives dearly, attacking the Traitor Marines with Chainswords and Power Axes in a futile attempt to repel them. The Purple Stars Astartes were wiped out, with the exception of two lone survivors: one was the Purple Stars Librarian Merchsturmer and the other was the ship's Astropath. Though mortally wounded, the Librarian had managed to acquire his fallen Battle-Brothers' Progenoid Glands, to be implanted into a future generation of Purple Stars Astartes. Before dying, Mechsturmer passed on a dire warning to the Imperium of Man: the the latest Black Crusade of Abaddon the Despoiler was fast approaching.

The Pyre
The Pyre is a Renegade Chapter of Chaos Space Marines that was formerly a Loyalist Chapter given the task of combating Chaos around the Eye of Terror but who were ultimately corrupted by Chaos and turned Traitor themselves.

Q
No known Chapters' names begin with the letter "Q."

Rainbow Warriors
The Rainbow Warriors are a Loyalist Space Marine Chapter of unknown origin and Founding of which there is almost no further mention in Imperial records. The Chapter's homeworld is called Prism. It should also be noted that in official Imperial records of Space Marine Chapter Homeworlds there is a map showing the locations of different Space Marine Chapters. There is one planet on this map where in the place of a Chapter name, it says "record deleted". By looking closely, it is clear that this deleted Chapter's badge is that of the Rainbow Warriors.

Rampagers
The Rampagers are a Loyalist Space Marine Chapter and a Second Founding Successor Chapter of the White Scars. Like their progenitors, the Rampagers make use of ritual facial scarring to denote both the rank and achievements of Astartes in the Chapter. These scars are applied during a long, sacred Chapter ceremony called the Blooding. The blood drawn from the faces of the Space Marines during this ritual is then mixed with the drinks served during the feast that always follows the completion of the ceremony

Ravagers
The Ravagers are a warband of Khornate Berserkers drawn from the World Eaters Traitor Legion that were active during the 930's.M41.

Raptors
The Raptors are a Loyalist Second Founding Successor Space Marine Chapter of the Raven Guard. They have been heavily involved in many of the most recent campaigns of the Imperium of Man, including the Badab War, the Third War for Armageddon and the Taros Campaign. The Raptors were originally and mistakenly recorded in Imperial records as a Chapter called the Raptor Legion with a very different colour scheme; this mistake has now been rectified. As a Chapter, the Raptors have been nearly rendered extinct multiple times, but have learned to adapt to changing circumstances so well that they have flourished where other Chapters would simply have had their names added to the ranks of the fallen. The Raptors' Chapter culture is one that is very wary of the idea of martial glory or honour, and prefers instead to emphasise pragmatism, adaptability and completion of the mission over all other concerns. The Raptors, having been reduced to so few Battle-Brothers so often in their history, have no illusions about what war truly is. They understand that war is suffering and death. It is a brutal business that they specialise in, but they have no desire to wallow in its misery beyond what is required to carry out the Emperor's will.

Raven Guard
The Raven Guard is one of the original First Founding Space Marine Legions and was originally the XIX Space Marine Legion before the Second Founding and the adoption of the Codex Astartes. The Primarch of the Raven Guard was Corax, a name which is a play on the Latin binomial species name for raven, corvus corax. The Raven Guard's homeworld is the planet called Deliverance, the airless mining moon of the Forge World Kiavahr, though its original name, before the Horus Heresy, was Lycaeum. The Raven Guard's fortress-monastery on Deliverance is known as the Ravenspire. The Raven Guard are known for their cool-headed, even intellectual temperament, their superb infiltration skills and skill at furious close-quarters engagements. The Raven Guard are the masters of unseen and guerilla warfare, only engaging in frontal assaults when no other option presents itself. The Raven Guard is also rightly feared for the potent units of Assault Marines they field, who use a pair of Lightning Claws instead of the usual Bolt Pistol and Chainsword. Captain Kayvaan Shrike, the famed commander of the Raven Guard's 3rd Company, is the commanding officer of just such a unit.

Reclaimers
The Reclaimers are one of the Loyalist Space Marine Chapters Founded as part of the Astartes Praeses - one of the 20 Chapters of Astartes mentioned in the ancient tome known as the Mythos Angelica Mortis that was created to defend the regions surrounding the Eye of Terror in the Segmentum Obscurus from the Forces of Chaos. The Reclaimers are a Chapter of unknown Founding and origin. The level of technology and weaponry used by the Reclaimers Chapter appears to be higher than the Imperial average, even among the usually well-equipped Astartes, leading many outsiders to suspect that their Armoury is particularly extensive and diverse. Their Power Armour is noted to be highly decorative and finely-crafted.

Red Hunters
The Red Hunters have unusually strong ties to the Inquisition for a Space Marines Chapter; the entire Chapter has been known to serve under an Inquisitor Lord of any of the three main Ordos on occasion.

Red Legion
The Red Legion is a Loyalist Codex Astartes-compliant Space Marine Chapter of unknown origin and Founding. This Chapter hails from the world of Oxatan.

Red Scimitars
The Red Scimitars are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in Imperial records except for the location of their homeworld within the Pandraxx Sub-Sector of the Acteron Sector of the Segmentum Ultima.

Red Scorpions
The Red Scorpions is a Loyalist Space Marine Chapter known to be composed of conservative Imperial purists who are famed for their complete and utter devotion to Imperial doctrine, past the point where pragmatism or even reason would seem to require otherwise. The Chapter is most renowned among other Astartes for their absolute adherence to every line of the Codex Astartes, which is unheard of in any other Chapter -- including the Ultramarines. They are considered perhaps the most intensely Loyalist and puritanical of all the Space Marine Chapters and will not serve beside any xenos or mutants, including even Imperially-sanctioned Abhumans like Squats and Ogryns. However, they have a high-regard for psykers and make extensive use of Space Marine Librarians. Equally unique in nature is the frequency with which the Red Scorpions' Apothecaries are present in the Chapter's Tactical Squads as squad leaders in place of a Sergeant.

Red Talons
The Red Talons are a Second Founding Successor Chapter of the Iron Hands. The Red Talons' fortress-monastery is located on their homeworld of Raikan. Beyond these facts, little else is known about the Chapter in Imperial records.

Red Templars
The Red Templars are a Codex Astartes-compliant Chapter of unknown origin or Founding date. The Chapter was Founded as a Successor Chapter of the Black Templars some time prior to the Second War for Armageddon.

Red Wings
The Red Wings are a Loyalist Space Marine Successor Chapter of the Blood Angels, created during an unknown Founding. Almost nothing is known about this Chapter in Imperial records. Created as they were from the Blood Angels' gene-seed, they too, carry the genetic Flaws inherited from the Primarch Sanguinius. Like many of their contemporary Successor Chapters founded in later centuries, the Red Wings were greatly affected by the genetic flaws of their Blood Angels' heritage known as the Black Rage and the Red Thirst.

Red Wolves
The Red Wolves are a Loyalist Chapter of Space Marines of unknown origin and Founding. Very little is known about the Chapter in Imperial records. The Red Wolves claim the planet of Bloodfall in the Segmentum Solar as their Chapter homeworld.

Redeemed
The Redeemed are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Redeemers
The Redeemers are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Relictors
The Relictors are a Renegade Space Marines Chapter Founded in the 36th Millennium, though of an unknown origin and Founding. When the Relictors were first established they were known as the Fire Claws. Founded to guard against the threat of the Traitor Legions attacking from the Eye of Terror, the Relictors were once counted amongst the most stalwart defenders of Mankind. But Chaos is insidious and a sinister secret now lurks at the heart of the Chapter, a secret that almost destroyed it and now threatens its very existence as well as the souls of its Battle-Brothers. The Relictors are believed by some to be a Successor Chapter of both the Ultramarines and the Dark Angels, as gene-seed from both Chapters was probably used in their Founding, though this remains unknown for certain. The Relictors were one of the 20 Chapters of the Astartes Praeses, created by the Imperium of Man after the Horus Heresy specifically to guard the threatened sectors of Imperial space surrounding the Eye of Terror.

Reparators
The Reparators are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Retractors
The Retractors are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Revelation of Gore, The
The Revelation of Gore is a warband of Chaos Space Marines. This warband was once a Loyalist Chapter of Space Marines of unknown origin and Founding known as the Tempest Legion. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Imperial Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, but by the time they made their way back into realspace, they had become the warband of Chaos Space Marines known as The Revelation of Gore.

Revilers
The Revilers are a Successor Chapter of the Raven Guard who specialise in jungle warfare.

Rhetors
The Rhetors are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in Imperial records.

Sable Swords
The Sable Swords are a Loyalist, Codex Astartes-compliant Space Marine Chapter said to be founded in the latter years of the 41st Millennium, making them one of the newest Space Marines Chapters to be raised. Their origin and founding remain unknown, but their fortress-monastery is located on the world of Obsidia in the Ultima Segmentum.

Salamanders
The Salamanders are a First Founding Space Marine Chapter whose Primarch was Vulkan. They originally served as the Imperium's XVIII Space Marine Legion during the Great Crusade and the Horus Heresy. Their homeworld is the volcanic Death World of Nocturne. The Salamanders as a Chapter are unusually concerned with preventing civilian casualties compared to most other Space Marines and believe that one of their most important duties is to protect the lives of the Emperor of Mankind's innocent subjects whenever and wherever possible. An unusual trait of the Salamanders is that their Battle-Brothers tend to be slower in reflex reaction than other Chapters. Their gene-seed also causes a peculiar reaction in these Astartes' Melanochrome organ, resulting in an individual Battle-Brother's skin becoming obsidian-black and their eyes blazing with a burning red glow.

Scythes of the Emperor
The Scythes of the Emperor are a Codex Astartes-compliant, Loyalist Chapter of Space Marines who are allegedly a Successor Chapter of the Ultramarines of the 25th Founding. The Scythes of the Emperor, along with their allies, the Lamenters Chapter, were virtually destroyed during the invasion of the Imperium of Man by the Tyranids' Hive Fleet Kraken.

Shadow Wolves
The Shadow Wolves were a Codex Astartes-compliant, Loyalist Space Marine Chapter derived from the Imperial Fists' gene-seed. Created during an unknown Founding, these Scions of Dorn were known to be a zealous and faithful Chapter by reputation, fighting for the honour of the Emperor of Mankind for thousands of Terran years, until they met their ultimate fate at the hands of a Tyranid splinter fleet in 987.M41 when their homeworld of Varadon was overrun by the xenos swarms.

Shining Blades
The Shining Blades were once a Loyalist Space Marine Chapter, their gene-seed once free from Chaotic taint, and the rigid mental training of their former incarnation gave them an unshakeable faith in its own abilities. They were victorious in battle so many times that they convinced themselves they could not fail, leading to the Berillia Massacres of 498.M34. Their overweening pride and wilful delusion caused them to attack, in a frenzy of indignation, any who questioned their magnificence. Renaming themselves the Flawless Host, they have scarred the Imperium ever since as hedonistic servants of Slaanesh, still believing themselves to be pinnacles of perfection.

Silver Eagles
The Silver Eagles are a Loyalist Codex Astartes-compliant Space Marine Chapter. They are a Second Founding Successor Chapter of the Ultramarines Legion. Little is known of this Chapter's history within the Imperial archives.

Silver Guard
The Silver Guard is a Loyalist Space Marine Chapter of unknown Founding and origin that fought to liberate the Sabbat Worlds Sector from the control of the Forces of Chaos during the Sabbat Worlds Crusade that began in 741.M41.

Silver Guards
The Silver Guards Chaper turned Renegade after the Obscuran Uprisings in the late 34th Millennium.

Silver Skulls
The Silver Skulls are a Codex Astartes-compliant Loyalist Chapter of Space Marines who are a possible Second Founding Successor Chapter of the Ultramarines, though this remains unconfirmed. The Silver Skulls have earned a reputation for achieving victory for the Imperium of Man no matter the odds stacked against them. Of course, this reputation has been earned because the Silver Skulls will only take to the battlefield when the psychic portents that their specialist Librarians known as Prognosticators receive from the Emperor indicate that the outcome of the combat will be favourable for the Chapter. The Silver Skulls' homeworld is the Feral World of Varsavia, which lies on the edge of the region of the galaxy known as the Gildar Rift in the Ultima Segmentum, a thinly settled area haunted by numerous xenos species. The Silver Skulls are known to engage in a number of barbaric rites that are likely to have emanated from the cultures from which they recruit. Notable amongst these is the practise of head taking, whereby especially potent enemies are beheaded during battle, their decapitated heads born as trophies until victory is won. As part of its post-battle celebrations, the Chapter selects the heads of the most powerful enemies, flense flesh from bone and layer the skulls in a coat of silver.

Silver Stars
The Silver Stars were once a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in current Imperial records except for the dire fate that they succumbed to. Unable to recover enough of the precious Progenoid Glands of their fallen Battle-Brothers, the Silver Stars could not cultivate further Astartes organ implants to create future generations of Space Marines for the Chapter. The Chapter quickly died off, unable to replace its losses. Like their counterparts, the Sons of Gorgax, this Chapter is now no more than a dusty memory, the only evidence of its existence being a dry footnote within the Index Astartes.

Skull Bearers
The Skull Bearers are a Loyalist Codex Astartes-compliant Space Marines Chapter of unknown origin and Founding who believe themselves to be a Successor Chapter of the zealous and ferocious Executioners Chapter. The validity of this belief is unknown. Very little else is known about this Chapter in current Imperial records.

Skulltakers
The Skulltakers are an infamous Khornate warband of Chaos Space Marines that follow the infamous Lord Zhufor. Formerly known as the Berserkers of Kharadon, this once-Loyalist Space Marine Chapter disappeared from the Imperium of Man from 153.M34 to 184.M39. During these five millennia the Berserkers of Kharadon turned to Chaos, and the bloody worship of Khorne, rechristening themselves the Skulltakers. With the Styx-class Heavy Cruiser Blood Dawn leading their fleet as its flagship, the Skulltakers have raided and plundered across the galaxy, killing indiscriminately and gathering skulls in the name of Khorne.

Skull Takers of Hans Kho'ren
The Skull Takers of Hans Kho'ren are a warband of Chaos Space Marines drawn from the World Eaters Traitor Legion that follow the infamous Chaos Lord Hans Kho'ren. They are notable for taking part in the First War for Armageddon.

Skyrar's Dark Wolves
Skyrar's Dark Wolves are a warband of Chaos Space Marines that might be possible splinter faction of formerly Loyalist Space Wolves Space Marines who turned to the Chaos Gods. They were first sighted by Imperial forces operating in the Fenris Sector.

Sky Sentinels
The Sky Sentinels are a Loyalist Codex Astartes-compliant Space Marine Chapter of unknown origin and Founding. This Chapter hails from the world of Pranagar.

Sons of Antaeus
The Sons of Antaeus are a Loyalist Space Marine Chapter created during the Cursed 21st Founding, and Imperial records concerning the activities of the Sons of Antaeus are few. Like the Antaeus of Greek myth, the Astartes of the Sons of Antaeus Chapter are unusually large and robust physical specimens, even among their kind, and they are capable of surviving wounds and physical injuries that would kill even other Space Marines. The obvious links between the Chapter's name and the ancient Terran Herculean mythology could hint at a link between the Sons of Antaeus and the Ultramarines Chapter, but there is no official evidence to back this assumption. There are many rumours as to why they are so difficult to destroy, ranging from reinforced skeletons to enhanced genetics. At this time, the truth remains unknown.

Sons of Damnation
The Sons of Damnation are a warband of Chaos Terminators that consist of a single squad drawn from the ranks of the Word Bearers Traitor Legion.

Sons of Dorn
The Sons of Dorn are a Loyalist Codex Astartes-compliant Space Marine Chapter and a Successor Chapter of the Imperial Fists. They were created during an unknown Founding at some time during the 34th Millennium. The Sons of Dorn's Chapter homeworld is the Feudal World of Archea which is located in the Segmentum Solar. In 999.M41 Archea was ravaged by a splinter fleet of the Tyranids' Hive Fleet Leviathan. With the bulk of their Chapter deployed in defence of the Imperium around the Eye of Terror to halt the 13th Black Crusade, much of Archea was consumed by the Great Devourer. With a world and a Chapter to rebuild, it will likely take several standard centuries before the Sons of Dorn are back to full strength.

Sons of Gideon
The Sons of Gideon were a former Loyalist Space Marine Chapter of unknown Founding and origin. The Crimson Fists Chapter was called upon by the High Lords of Terra to exterminate the Sons of Gideon because they had been declared Excommunicate Traitoris after a routine examination of their gene-seed revealed that it had mutated to such an extent that the Space Marines of this Chapter had been driven insane by a chemical imbalance. The Crimson Fists mercilessly destroyed the Sons of Gideon's homeworld of Gideon IV and then hunted down the Sons of Gideon's 3rd Company which had escaped the initial assault and had been butchering its way through the 4 billion citizens of the Colar System. Almost nothing else is known about this Chapter in the Imperial records.

Sons of Gorgax
The Sons of Gorgax were once a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in current Imperial records except for the dire fate that they succumbed to. Unable to recover the precious Progenoid Glands of their fallen Battle-Brothers in large enough amounts, the Sons of Gorgax were unable to cultivate further organ implants for future generations of new Space Marines for the Chapter. The Chapter quickly died off, unable to replace its losses. This Chapter is now no more than a dusty memory, the only evidence of its existence an ancient record within the Index Astartes.

Sons of Guilliman
The Sons of Guilliman is a Space Marine Chapter created during the 33rd Millennium from Ultramarines gene-seed.

Sons of Jaghatai
The Sons of Jaghatai are a Codex Astartes-compliant Loyalist Space Marine Chapter of unknown Founding. They are a Successor Chapter of the White Scars. Almost nothing is known about this Chapter in current Imperial records.

Sons of Horus
The Sons of Horus was the name given to the Luna Wolves Legion after their Primarch Horus was named Warmaster by the Emperor, to carry on the Great Crusade in his name after he returned to Terra following the Ullanor Crusade in the late 30th Millennium. Horus resisted using this name, which he found overly grandiose, until after his corruption by Chaos, when he found such monuments to his ego far more fitting. Today, at the end of the 41st Millennium, the Sons of Horus are the Chaos Space Marines collectively called the Black Legion and they are led by Horus' self-proclaimed successor and former First Captain of the XVI Legion, Abaddon the Despoiler.

Sons of Malice
The Sons of Malice are a Renegade Chapter of Chaos Space Marines who turned Renegade some time prior to the start of the 13th Black Crusade in 999.M41. The Sons of Malice were originally Founded to watch over the sectors of Imperial space surrounding the Eye of Terror as one of the 20 Chapters of the Astartes Praeses. Events leading to the Chapter's excommunication began following the successful end of the Cilix 225 Campaign against heretics who had threatened to depressurize three underwater hive cities on that world, and ultimately led the Chapter to declare itself to be both enemies of the Imperium of Man and the Forces of Chaos even as it took up service with a Chaos God, the Renegade God Malal, also called Malice, the Hierarch of Anarchy and Terror. Perhaps the Chapter's most eerie quality is that the Sons of Malice reportedly fight in utter silence, and those who have fought against them cite this as the prime source of the deeply disturbing aura surrounding them.

Sons of Medusa
The Sons of Medusa are a Loyalist Successor Chapter of Space Marines drawn from the unforgiving Iron Hands Chapter whose existence was ratified by an Imperial edict of the High Lords of Terra in 011.M37. The Sons of Medusa are a Chapter with a history of ruthless efficiency in the merciless persecution of the Imperium of Man's foes. Like their forebears, they are extreme devotees of the Emperor of Mankind and look with disgust upon those who lack their strength of will. They are a distinguished Chapter whose long roll of battle honours can be traced back to the early 37th Millennium.

Sons of Midnight
The Sons of Midnight are a warband of Chaos Space Marines. They were once a Loyalist Chapter of Space Marines of unknown origin and Founding known as the Star Gryphons. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Imperial Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, but by the time they made their way back into realspace, they had become the warband of Chaos Space Marines known as the Sons of Midnight.

Sons of Orar
The Sons of Orar is a Codex Astartes-compliant Chapter of unknown origin, though the Chapter symbol is closely related to the Ultramarines' symbol. Though the history of the Sons of Orar has been lost, what is known is that they revere Orar, an Ultramarines Legion Captain who won great renown in the wake of the Horus Heresy.

Sons of the Eye
The Sons of the Eye were a large warband of Chaos Space Marines dedicated to Chaos Undivided. The Sons of the Eye were a splinter warband of the Black Legion that was founded and commanded by the infamous Chaos Lord Drecarth the Sightless, the Blind Butcher of Irridous VII, a former Battle-Brother of the Sons of Horus who had fought alongside Abaddon during the Great Crusade and the Horus Heresy that followed. Always jealous of the Primarch Horus' favour for the Despoiler, the Sons of the Eye considered Abaddon a usurper. During the 6th Black Crusade, launched in 901.M36, Abaddon visited his wrath upon Drecarth the Sightless and his treacherous warband. Abaddon aided the Sons of the Eye in an assault on the Forge World of Arkreach, fighting side-by-side until the defenders were finally crushed. The triumphant Abaddon then slowly killed Drecarth, even as he made him watch every member of the Sons of the Eye bow before their new master.

Sons of Vengeance
The Sons of Vengeance are a Renegade Chapter of Chaos Space Marines who turned to the service of the Ruinous Powers alongside the Silver Guards during the Obscuran Uprisings which ravaged the Segmentum Obscurus during the 34th Millennium.

Sons of Ulthunas
The Sons of Ulthunas were a formerly Loyalist Space MarineChapter that turned Renegade against the Imperium of Man during the Ganymathian Betrayal. They are currently known as the Angels of Ecstacy and are Chaos Space Marines who serve Slaanesh, the Pleasure God. It is unclear if they are merely Renegade Space Marines who refuse to recognise Imperial rule or are now fully committed to the service of the Prince of Pleasure as Traitor Marines, though their increasingly mutated appearance and Chapter colour scheme would indicate that this is firmly the case.

Soul Drinkers
The Soul Drinkers are a Space Marines Chapter supposedly created during the Second Founding, who were allegedly created from the Imperial Fists gene-seed. The Soul Drinkers threw off the yoke of the Imperium which they believed was corrupt and were declared Excommunicate Traitoris by the Inquisition, but they are still loyal to the Emperor and their gene-seed was stabilised after numerous mutations. Recent events revealed that the Soul Drinkers were not in fact the genetic sons of the Primarch Rogal Dorn and the provenance of the Chapter is now unknown. The Soul Drinkers were ultimately destroyed as a Chapter in the late 41st Millennium when they worked with the Imperial Fists to end a Chaotic plot initiated by one of their own number, the Venerable Chaplain Dreadnought Daenyathos, to seize control of the Imperial Fists' mobile fortress-monastery, the Phalanx, and spread the power of Chaos across the galaxy. Though the Chapter has ceased to exist, the Imperial Fists honour its Astartes' final sacrifice in the defence of Mankind.

Space Sharks
The Space Sharks are a Loyalist Chapter of Space Marines of the Second Founding whose origin remains unknown and who are the current guardians of the Endymion Cluster of worlds in the Maelstrom Zone of the Segmentum Ultima. The Endymion Cluster is the region once governed by the Mantis Warriors Chapter which the Space Sharks were granted following the Badab War as compensation for their losses. Before that conflict, the Space Sharks were a Fleet-based Chapter. It is not entirely clear whether the Space Sharks are a separate Chapter or are the same group of Astartes as the recently returned Carcharodons Chapter that also took part in the Badab War.

Space Wolves
The Space Wolves are one of the original 20 First Founding Space Marine Legions, and were once led by their famed Primarch, Leman Russ. The Space Wolves are renowned for their anti-authoritarian ways and their embrace of their homeworld Fenris' savage barbarian culture as well as their extreme deviation from the Codex Astartes in the Chapter's organisation. After the Horus Heresy and the resultant Second Founding reforms of the Adeptus Astartes, the Space Wolves Legion was divided into two Chapters: the new Space Wolves Chapter, which was not compliant with the dictates of the Codex Astartes and retained the name of its parent Legion, and the second Chapter which took the name of the Wolf Brothers. The Wolf Brothers suffered from rampant mutation of their gene-seed not long after their Founding and were later disbanded. It is currently unknown if there are any other Successor Chapters of the Space Wolves in the Imperium.

Star Dragons
The Star Dragons are a Loyalist Codex Astartes-compliant Space Marines Chapter of unknown Founding and origin. The Chapter homeworld of the Star Dragons is the planet Draconith. Currently, the Star Dragons have joined with the Blood Swords Chapter to travel the wastes of space near the Eye of Terror in a joint containment fleet designated Containment Fleet Kappa. For centuries these two Chapters had frequently joined forces when a given situation demanded it. The close proximity of their homeworlds of Jaggafall and Draconith had given them great reason to remain cordial and closely allied. Sometime in its recent history the Blood Swords Chapter was torn from its homeworld. This act of shame resulted in the Chapter undertaking a Penitent Crusade in order to redeem themselves in the eyes of the Emperor of Mankind. In the wake of the act of shame that saw the Blood Swords torn from their homeworld the Star Dragons had moved to support them.

Star Leopards
The Star Leopards are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in Imperial records.

Star Phantoms
The Star Phantoms are a Loyalist Space Marine Chapter of the 23rd Founding, the so-called "Sentinel" Founding, created in the early 38th Millennium from an unknown origin. During this tumultuous period of history, the Star Phantoms were one of several Chapters whose mission was to take and hold various xenos-contested regions on the very borders of the Emperor’s domains. They took part in the final days of the Badab War and the final assault upon the Renegade Astral Claws' Chapter homeworld of Badab Primaris, helping bring the war to a successful conclusion. The Star Phantoms display a peculiarly idiosyncratic Chapter Cult. The Chapter’s rites and traditions focus on death and martyrdom, the fallen being revered over and above the living symbols of death and mourning are used as Chapter iconography, the Chapter symbol itself featuring a sand-timer surmounted by two death’s heads. This trait extends to a generalised disregard for the living that has often manifested in excessive collateral damage amongst populations the Chapter has been tasked with purging of insurrectionist elements, and even amongst allied units.

Star Scorpions
The Star Scorpions were a Loyalist Space Marine Chapter of the 25th Founding of unknown origin. They are now considered extinct, a lost Chapter of Astartes. It is unknown what Chapter provided the gene-seed for the Star Scorpions' Founding and little else about the Chapter is available in Imperial records.

Steel Confessors
The Steel Confessors are a Loyalist Space Marine Chapter secretly Founded in the 36th Millennium during the 19th Founding by the Adeptus Mechanicus for its own use from the gene-seed of the Iron Hands. After their discovery by the Inquisition, the Steel Confessors were forced to become an independent Chapter of the Adeptus Mechanicus, but they still maintain unusually close ties with the Mechanicum of Mars. They recently successfully defended their homeworld, the Forge World of Kalevala, from an attack by the Tyranid Hive Fleet Leviathan, though at great cost to the Chapter.

Stone Hearts
The Stone Hearts are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in Imperial records. Stone Hearts Battle-Brothers are known for marking their bodies with intricate tattoos that denote each battle that they have fought in.

Storm Callers
The Storm Callers is a Loyalist Space Marine Chapter of unknown origin and Founding. Nothing else is currently known about them in Imperial records other than that portions of the Chapter were corrupted by Chaos during the Storm Callers advance into the Taninim Expanse, a civil war was fought within the ranks of the Chapter and the Loyalists emerged triumphant, purging the Traitors from their midst.

Storm Falcons
The Storm Falcons are a Loyalist Codex Astartes-compliant Space Marine Chapter of unknown origin and Founding. Virtually nothing is known about this obscure Chapter within the official Imperial archives, except the name of the Chapter' homeworld of Talon located in the Segmentum Ultima in the Hodur Sector. In 997.M41, Hive Fleet Leviathan encroached into Imperial space. The Tyranids, under the direction of the legendary synapse creature known as the Swarmlord, orchestrated multiple planetary invasions. In the span of only four months, the Swarmlord oversaw the absorption of 24 worlds, including the Storm Falcons' Chapter homeworld of Talon. This resulted in a series of swift victories for the Leviathan along the spine of worlds within the Hodur Sector. Talon was subsequently abandoned. Whether or not the Storm Falcons fought to the last or simply abandoned their doomed planet is not known. The Chapter's current fate remains unknown.

Storm Giants
The Storm Giants are a Loyalist Codex Astartes-compliant Chapter of Space Marines created during the 26th Founding in 738.M41. Their origins remain unknown, though many suspect that they are a Successor Chapter of the Salamanders of Nocturne. The Storm Giants are primarily a Fleet-based Chapter, preferring to meet any threats to the Imperium of Mankind on their own terms. They also do not want to be tied down to any one world, having to defend a fortress-monastery in case they are ever attacked, as has happened to to many other Space Marine Chapters. As a Fleet-based Chapter, the Storm Giants can stay mobile while avoiding those that would bring ill fortune upon their Chapter.

Storm Hawks
The Storm Hawks are a Loyalist Codex Astartes-compliant Space Marine Chapter and a rare Successor Chapter of the Raven Guard. Their exact founding date is unknown but the Storm Hawks are thought to be related to the Raven Guard through a later Founding.

Storm Lords
The Storm Lords are a Loyalist Space Marines Chapter and a very rare Second Founding Successor Chapter created from the gene-seed of the White Scars.

Storm Wardens
The Storm Wardens are a Codex Astartes-compliant Space Marine Chapter of unknown founding and origin based on the Forbidden World of Sacris in the Calixis Sector of the Segmentum Obscurus. Their entire 1st Company and Chapter Master Owin Glandwyr were placed into stasis within a sealed portion of the Chapter's fortress-monastery on Sacris following the Nemesis Incident of 945.M36. Furthermore, the Chapter homeworld of Sacris was forbidden to have any contact with the rest of the Imperium by the Inquisition. The reason for these steps remain unknown.

Storm Warriors
The Storm Warriors are a Loyalist Codex Astartes-compliant Space Marines Chapter of unknown origin and Founding. It appears that they are a late Founding Chapter. However, beyond this, almost nothing is known about the Storm Warriors in Imperial records.

Storm Wings
The Storm Wings are a Loyalist Codex Astartes-compliant Space Marine Chapter of unknown origin and Founding. The Storm Wings Chapter homeworld is the Eyrie, a planet in the Segmentum Solar. Nothing else is known about them in Imperial records.

Subjugators
The Subjugators are a Loyalist Space Marine Chapter suspected to be a Successor Chapter of the Imperial Fists' created during either the 23rd or 24th Founding in the 41st Millennium. The Subjugators are one of the 20 Chapters of the Astartes Praeses who were specifically created to guard the sectors of the Imperium that lie near the Eye of Terror. The Chapter's homeworld is called Xenax, which lies in the Segmentum Solar.

Supplicators
The Supplicators are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Swords of Praesium
The Swords of Praesium are a Loyalist Codex Astartes-compliant Space Marine Chapter of unknown Founding or origin. Little is known of this Chapter's history within the Imperial archives, save from the fact that part of this chapter turned Renegade on the world of Acropolis Vega after being trapped by a Warp Storm for 70 years.

Swords of the Emperor
The Swords of the Emperor are a Loyalist Codex Astartes-compliant Space Marine Chapter of unknown Founding or origin. Little is known of this Chapter's history within the Imperial archives.

Tainted, The
The Tainted are a large warband of Chaos Space Marines drawn from the Death Guard Traitor Legion who are dedicated to the Plague Lord Nurgle in his aspects as the God of Despair and the Mortifier of the Flesh. The Tainted supplement their numbers on the battlefield with a large number of disease-ridden Chaos Spawn called "Plague Spawn," mutated Plague Ogryns and other horribly mutated beasts who are collectively known as the "Rotted Circus". The most powerful of these beasts was a massive Chaos Spawn riddled with Grandfather Nurgle's plagues who was named "Jibberjaw". The Tainted were one of the 11 Chaos Space Marine warbands to participate in the Siege of Vraks, seeking to aid the Forces of Chaos in the defence of the Imperial Armoury World of Vraks that they had seized from the Emperor under the leadership of the Apostate Cardinal Xaphan.

Talons of Anathrax
The Talons of Anathrax are a warband of Chaos Space Marines. They were once a Loyalist Chapter of Space Marines of unknown origin and Founding, known as the Argent Hammers. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Imperial Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, but by the time they made their way back into realspace, they had become the warband of Chaos Space Marines known as the Talons of Anathrax, named for the Daemon World of Anathrax where they had been corrupted.

Tarantulas
The Tarantulas are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in Imperial records.

Taurans
The Taurans are a Loyalist Chapter of Codex Astartes-compliant Space Marines of unknown Founding and origin. Nothing else is known about the Chapter in Imperial records.

Tempestors
The Tempestors are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Templars of Blood
The Templars of Blood are a Chapter of Loyalist Space Marines and Successors to the Blood Angels of an unknown Founding. Like their progenitor Chapter, these sons of the Primarch Sanguinius take pride in their ability to meet the foe head-on, although this is where the similarities between the Chapters end. The Astartes of the Templars of Blood are known to suffer from the Flaw of Sanguinius known as the Black Rage at a much reduced rate compared to the Blood Angels or their other Successor Chapters. This reason for this is unknown, though some suspect the Chapter has bought this boon through dark and secretive means.

Terror Tigers
The Terror Tigers played a small part in the Inquisition War trilogy novel Harlequin by Ian Watson. They lost one quarter of their Chapter when a mutant warlord assaulted their homeworld, after which their Chapter Master ordered his own execution as punishment. An exploration team of Terror Tigers rediscovered the lost Feral World of Hannibal, intervening in an Eldar attempt to reclaim the world as their own. The team dramatically came to the primitive human natives' rescue from those deceitful xenos.

Thousand Sons
The Thousand Sons are a Traitor Legion of Chaos Space Marines wholly dedicated to the service of the Chaos God Tzeentch who were once one of the First Founding Space Marine Legions before the Horus Heresy. The Legion's Primarch was Magnus the Red, an unusual Primarch who possessed potent psychic powers and a deep knowledge of sorcery. Magnus the Red is presently a Daemon Prince of Tzeentch. The Thousand Sons also had an unusually high number of psykers in their midst, a number which only increased after they swore themselves to the service of the Changer of Ways, who is the Chaos God of Sorcery. Due to the workings of a potent sorcerous spell called the Rubric of Ahriman, none of the Thousand Sons Chaos Marines possess organic bodies any longer; instead, their souls have been directly fused with their suits of ancient Power Armour. The Thousand Sons may also have included a small contingent of Space Marines who remained loyal to the Emperor during the Heresy, refused to flee into the Eye of Terror and split off to form their own Loyalist Chapter. The descendants of these Space Marines may be the current Blood Ravens Chapter, which like the Thousand Sons possesses an unusual number of psykers among its Battle-Brothers.

Thunder Barons
The Thunder Barons are a Renegade Chapter of Chaos Space Marines of unknown origin. Formerly a Loyalist Chapter of Astartes, they eventually spat on their oaths to the Emperor of Mankind and instead swore their allegiance to the Chaos Gods, and to the Blood God Khorne in particular. Since their fall to Chaos, the Thunder Barons have become obsessed with looking for amulets and artefacts of arcane power that will enhance their abilities in combat -- and provide more victims for the Blood God's pleasure.

Tiger Claws
The Tiger Claws Chapter was the original name for the Traitor Marines who now call themselves the Astral Claws. They were depicted as wearing black and orange tiger-striped Power Armour with a tiger head as their symbol. Imperial records were later amended to indicate that the Tiger Claws were in fact a separate Loyalist Chapter of Space Marines who were later believed destroyed in the Warp by the Imperium. However, a large portion of their Astartes survived and were illegally absorbed into the Astral Claws Chapter. They are now rightfully considered a part of that Renegade group of Astartes (see Red Corsairs).

Tigers Argent
The Tigers Argent are a Loyalist Chapter of Codex Astartes-compliant Space Marines of unknown Founding and origin. They aided the Imperial Angevin Crusade that conquered the Calixis Sector of the Segmentum Obscurus for the Imperium of Man in the early 39th Millennium. There is little else currently known to be recorded about them in Imperial records other than that their homeworld is known as Icefang.

Tormentors
The Tormentors are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Tributors
The Tributors are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Twisted Blades
The Twisted Blades are a warband of Chaos Space Marines. They were once a Loyalist Chapter of Space Marines of unknown origin and Founding, known as the Graven Fists. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Imperial Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, but by the time they made their way back into realspace, they had become the warband of Chaos Space Marines known as the Twisted Blades.

Ultramarines
The Ultramarines, the direct descendants of the XIII Space Marine Legion of the First Founding, are considered the greatest of all the Space Marine Chapters in the Imperium of Man, almost single-handedly holding the Imperium together after the Horus Heresy. They are currently led by their famed Chapter Master, Marneus Augustus Calgar, the Lord Macragge. Their homeworld is Macragge in the autonomous Imperial Realm of Ultramar. The Ultramarines have more Successor Chapters descended from their gene-seed than any other First Founding Legion.

Unhallowed, The
The Unhallowed are a warband of Chaos Space Marines. They were once a Loyalist Chapter of Space Marines of unknown origin and Founding, known as the Invictors. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Imperial Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, but by the time they made their way back into realspace, they had become the warband of Chaos Space Marines known as The Unhallowed.

Valedictors
The Valedictors are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records. The Valedictors were originally a First Founding Legion which saw action on the Eastern Fringe of the Imperium against Orks, Eldar, and Traitors during the Horus Heresy. They were described in detail in two Epic articles in White Dwarf 126 and 136, (circa 1990-91). The status of the Valedictors changed in White Dwarf 235, where they are said to be of a "later Founding," (post-Second Founding). Therefore, the Valedictors are no longer a First Founding Legion.

Vectors of Pox
The Vectors of Pox are a warband of Chaos Space Marines. They were once a Loyalist Chapter of Space Marines of unknown origin and Founding, known as the Doom Legion. The Doom Legion was responsible for the maintenance and garrison of the Faithful's Deliverance, the pre-Horus Heresy star fortress that overlooks the notorious Elusian Maze asteroid fields. Few other Space Marine Chapters could boast spaceborne firepower of this magnitude. All that is known about the Doom Legion's homeworld, Elusia Prime, is that it was situated within the Ultima Segmentum. They were corrupted after entering the Eye of Terror in 321.M37 as part of the Imperial Abyssal Crusade. It is unknown what they endured during their sojourn into the Eye, but by the time they made their way back into realspace, they had become the warband of Chaos Space Marines known as the Vectors of Pox.

Venerators
The Venerators were a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in Imperial records. During the 5th Black Crusade in 723.M36, Abaddon the Despoiler scoured the Elysia Sector, raiding hundreds of Imperial worlds and causing untold death and destruction. On Tarinth, the Despoiler lured the Warhawks and Venerators Chapters into the ruins of Kasyr Lutein where he trapped them between the daemonic hordes of Khorne and the forces of the Black Legion. In a bitter last stand, both Loyalist Chapters were utterly destroyed, their skulls taken by the ancient Daemon Prince Doombreed, whose existence preceded that of the Imperium itself, to be mounted upon the mighty Skull Throne of the Blood God.

Venerators of Osiron
The Venerators of Osiron are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Victors
The Victors are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Vindicators
The Vindicators are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Viper Legion
The Viper Legion is a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in Imperial records except that they are based in the Aurelius System.

Violators
The Violators are a warband of Chaos Space Marines that are dedicated to the Chaos God Slaanesh, the Prince of Pleasure. The mutated bodies of these Chaos Space Marines are treated as personal temples to the Prince of Chaos, whom it is said looks very favourably upon these corrupted Astartes. Because of this, warriors of the Violators almost never willingly remove their Power Armour, for they consider it to be sacrilegious. A Violators warrior will only do so in the presence of those whom they truly believe are worthy -- those who fully embody Slaanesh's ideals of pleasure and perfection. They have also been known to reveal themselves before a worthy adversary before combat commences. Often their bodies are surgically altered so that their physical sensations are heightened unimaginably by changes made to their neural architecture. The Violators have also been known to use electrical pulses produced by implanted electrodes to stimulate the parts of the brain that produce pleasure.

Vorpal Swords
The Vorpal Swords are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in Imperial records other than their participation in the Gheistos Cataclysm.

Warhawks
The Warhawks were a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in Imperial records. During the Fifth Black Crusade in 723.M36, Abaddon scours the Elysia Sector, raiding hundreds of worlds and causing untold death and destruction. On Tarinth, the Despoiler lures the Warhawks and Venerators Chapters into the ruins of Kasyr Lutein where he traps them between the daemonic hordes of Khorne and the Black Legion. In a bitter last stand, both loyalist Chapters are utterly destroyed, their skulls taken by the ancient Daemon Prince Doombreed, whose existence precedes that of the Imperium itself, to be mounted upon the mighty throne of the Blood God.

Warmongers
The Warmongers are a Loyalist Codex Astartes-compliant Space Marine Chapter of unknown origin and Founding. Little else is recorded about them in Imperial records.

Widowmakers
The Widowmakers are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in Imperial records.

War Bearers
The War Bearers are a Loyalist Chapter of Codex Astartes-compliant Space Marines of unknown Founding and origin. Nothing else is known about them in Imperial records.

Warband of Sektoth
The Warband of Sektoth is a large warband of Chaos Space Marines dedicated to the service of Tzeentch, the Changer of Ways. The Warband of Sektoth is a splinter warband of the Thousand Sons Traitor Legion that was founded and commanded by the infamous Chaos Sorcerer Sektoth the Whisper, a master manipulator of the power of the Warp. This warband is active in the Calixis Sector and the Screaming Vortex, one of two massive Warp Storms which separate the Calixis Sector of the Imperium from the Koronus Expanse.

Warp Ghosts
The Warp Ghosts are a Renegade Chapter of Chaos Space Marines of unknown Founding and origin, whose survivors now serve the Chaos God Nurgle, the Plague Lord. The Chapter betrayed the Imperium of Man and turned to Chaos, allying themselves with Abaddon's 13th Black Crusade in 999.M41. Being only a single Renegade Chapter, the Warp Ghosts have far fewer Chaos Space Marines and equipment than the original Traitor Legions, but are still renowned for their ferocity amongst the Forces of Chaos. The Bleak Brotherhood is believed to be a faction or warband of the Warp Ghosts.

War Hounds
The War Hounds were the XII Space Marine Legion raised by the Emperor of Mankind on Terra at the dawn of the Great Crusade in the late 30th Millennium. After the Emperor discovered the Legion's Primarch Angron on the Feudal World of Nuceria, and gave him command of the War Hounds, Angron changed the name of the Legion to the World Eaters, in honour of the gladiator force he had led in rebellion on his homeworld, whose warriors came to be known as the "Eaters of Cites," for their wrath and violence. Angron expected that his Legion would become the "Eaters of Worlds."

Warrior Adepts
The Warrior Adepts are a Loyalist Chapter of Codex Astartes-compliant Space Marines of unknown origins and Founding. Nothing else is known about them in Imperial records.

Warriors Tempest
The Warriors Tempest are a Loyalist Space Marine Chapter of unknown Founding and origin. Almost nothing is known about this Chapter in the Imperial records.

Warriors of Aggannor
The Warriors of Aggannor are a warband of Chaos Space Marines composed of an amalgam of warriors from multiple Chaos Space Marine warbands and the Traitor Legions. Numerous Night Lords and Word Bearers Traitor Marines swore allegiance to the Chaos Lord Aggannor and were responsible for a major Chaos incursion on Calibos III during Goge Vandire's Reign of Blood in the Age of Apostasy in the 36th Millennium.

Warriors of Mayhem
The Warriors of Mayhem are a warband of Chaos Space Marines of unknown origin and allegiance. This warband was first sighted by Imperial forces in 925.M41.

White Consuls
The White Consuls are a Second Founding Chapter of Space Marines. They are listed in the Apocrypha of Davio as having derived from the Ultramarines' gene-seed. Unlike other Astartes Chapters, they are unusual in that they maintain two Chapter Masters simultaneously -- one leading the Chapter to war as battlemaster, the other as the Proconsul of Sabbatine and its vassal star system, overseeing the defence of the Chapter's homworld and commanding a standing force ready at a moment's notice to respond to incursions through the Cadian Gate.

White Minotaurs
The White Minotaurs are a Codex Astartes-compliant Chapterof unknown origin and Founding date.

White Panthers
The White Panthers are a Codex Astartes-compliant Space Marine Chapter Founded in 738.M41 during the 26th Founding. They are a Chapter of unknown origin, but are highly suspected to descend from Ultramarines' gene-seed due to their predilection for being strict adherents of the Codex Astartes.

White Scars
The White Scars are a Loyalist Space Marine Chapter, founded from the genetic template of their Primarch Jaghatai Khan. They were also one of the First Founding Legions of the Legiones Astartes, in this case the V Legion. Known and feared throughout the Imperium of Man for their highly mobile way of war, the White Scars are considered the masters of the lightning strike and hit-and-run attack and are particularly adapted to the use of the Astartes Assault Bike as their mechanical steeds and their forces contain an unusually large number of Bike Squads compared to other Chapters. Bearing the ritual scars of bravery, these fierce warriors fight with all the tribal savagery that define the fierce steppe nomads of their homeworld Mundus Planus, bringing swift death to all of the enemies of the Imperium.

White Templars
The White Templars are a Loyalist Codex Astartes-compliant Space Marine Chapter of unknown origin and Founding, but rumoured to be a Successor Chapter of the zealous Black Templars Chapter. The Black Templars' secretive nature means it is difficult to confirm or deny this, but if the rumours are true, then the White Templars are only the second Chapter to be Founded from the Black Templars' gene-stock; the first was the Red Templars. The White Templars' Chapter homeworld is the planet named Sanctum, located in the Segmentum Solar. Virtually nothing else is known about the Chapter in Imperial records.

Wolf Brothers
The Wolf Brothers were the only known Second Founding Successor Chapter of Space Marines created from the gene-seed of the Space Wolves Legion. The Chapter was eventually forcibly disbanded by the Inquisition as a result of the rampant genetic instability and resulting mutation that appeared in the Chapter's Battle-Brothers. This instability may have been the "Wulfen" gene that manifests itself at times in the Space Wolves themselves, most obviously among the Space Marines of the Chapter's 13th Great Company. Some Wolf Brothers, however, chose to go Renegade rather than be liquidated and eventually became Chaos Space Marines in service to the Space Wolves' greatest enemies, the Thousand Sons Traitor Legion, and later to other Chaos Space Marine warbands such as the Red Corsairs. Some of these Renegades remain at large in the 41st Millennium, though the vast majority of the Chapter was liquidated millennia ago.

Yellow Jackets
The Yellow Jackets are a Loyalist Second Founding Chapter of Space Marines of unknown origin.