Primarch

The Primarchs were the 20 genetically-engineered sons of the Emperor of Mankind. They were intended to be the immortal and superhuman leaders who would command the Emperor's Great Crusade to reunite the scattered human race beneath his leadership. Their genomes would later serve as the genetic template from which the Emperor would craft his 20 Space Marine Legions. They were bred to be perfect generals, warriors and statesmen; larger, stronger, faster, and smarter than any normal human could ever hope to be. They possessed a charisma and martial prowess that made them like the mythical gods of old, untouchable by disease, old age or supposedly the petty failings of lesser men. The Primarchs were the Emperor's answer to reclaiming all the lost worlds of mankind, and welcoming them into his new Imperium. The Emperor intended to raise his sons to be the best military commanders and political leaders Mankind had ever known, and they would bring the Imperial Truth to the rest of the human-settled galaxy in their father's name.

How the Emperor's crafted 20 individual genomes using his own arcane geentic code as the base without resulting to cloning is unknown to present Imperial science. It is believed that there was more than just physical manipulation of the genetics, however, and that the Emperor called upon many of the same techniques of psychic sorcery that had been used in his creation millennia before by the shamans of Old Earth. This meant that the Primarchs were intended to be spiritually as well as physically engineered and may explain why the Primarchs possessed so much personal magnetism and charisma beyond what even their enhanced genetics would predict. But such techniques also meant that the Primarchs were unusually vulnerable to the effects of Chaos since their souls would shine so brightly in the Immaterium and draw the attention of daemonic entities like moths to a candle flame. This is why the Emperor carefully inscribed arcane glyphs of protection on each Primarch's gestation capsule and around the gene-vault deep beneath the Imperial Palace where they were created. Unfortunately, this protection proved insufficient, for the Chaos Gods learned of the Emperor's plans and decided they had no wish to see his attempts to weaken their powers by extending the grip of Order across the galaxy.

The Ruinous Powers of Chaos somehow spirited the children away through the Warp, however, leaving them scattered across the galaxy. A massive localized Warp rift was created within the gene vaults of the Emperor's own palace, deep under the Himalayan Mountains on Terra where the Primarchs were gestating. The gestation capsules containing the Emperor's unborn sons were scattered through the Warp to colony planets long since lost to Mankind. It may have been at this time, when first touched by the hands of Chaos, that the first seeds of corruption were laid in the breats of those Primarchs who would eventually turn Traitor to the Emperor and his Imperium. Whether the Emperor was able to affect this outcome is unsure, but every Primarch landed on ancient worlds of men, planets long since lost to the light of the greater universe beyond the stars. This was a massive setback to the Emperor's plans. He had counted on his mighty generals leading his army of conquest out from Terra. Without them, his plans, so many millenia in the making, rested on a knife's edge. He needed an edge, something to give Mankind an advantage as they struck out against a very hostile galaxy once more. Taking the remaining samples of genetic material from each of his lost Primarchs, the Emperor crafted the first gene-seed, stem cell zygotes from which could be cultured genetically-engineered organs that contained many of the physical and mental traits possessed by each Primarch. The Emperor implanted these organs into his bravest, strongest,and best human warriors who would stand by his side as the vanguard of the Great Crusade. Thus were born the Legiones Astartes, the Space Marines, and they would reconquer the galaxy at the side of the Emperor. As the new interstellar human empire expanded, the Emperor used his powerful gifts of psychic foresight and precognition to track down his wayward sons, scattered across the galaxy, and reunite them with their respective Legions. Each Primarch was both a father and older brother to each Legion, the source of the Legion's temperment and humours, a being in which each Legion saw their ultimate perfection and ways of war given personification in one perfect individual. This time marked the height of the Great Crusade. Thousands of worlds fell to "Imperial Compliance," and then hundreds of thousands, to the newly reunited Primarchs and their Space Marine Legions. Like the gods of mythic legend they strode the battlefields of the galaxy, and their power was unstoppable. Yet the Primarchs, for all their expressed superiority, were still men, and they possessed too many of the same human flaws that have bedeviled Mankind since the birth of the species. They proved jealous and arrogant, highly competitive and all too willing to hold grudges against one another and even their father the Emperor. Whether these flaws were the result of their exposure to the corrupting power of Chaos as infants or were simply the natural human flaws that could not be excised even from the progeny of the Emperor is unknown. Yet, ultimately, it was the Primarchs' all-to-human flaws that doomed the Imperium to the nightmare of the Horus Heresy and 10,000 standard years of stagnation, decay, repression and endless war.

At the height of the Great Crusade, Warmaster Horus fell to the temptations of Chaos, and convinced eight of his fellow Primarchs to rebel against the Emperor and follow him in his attempt to supplant the Master of Mankind. During the Horus Heresy, brother fought brother as the Primarchs led their Traitor Legions against their former comrades who remained Loyal; Horus himself fought the Blood Angels' Primarch Sanguinius and the Emperor. At the height of the final battle, above the surface of Terra on Horus' own flagship, the Battle Barge Vengeful Spirit, the Emperor clashed with the Warmaster. The Emperor was reluctant to use his full power against his most beloved son, and it was not until Horus had mortally crippled the Emperor and killed Sanguinius that the Emperor finally utilized the full extent of his unimaginable psychic powers to bring the Warmaster down and eradicate even his soul from the Warp so that the Ruinous Powers could not restore him to some semblance of horrid life. Most of the remaining Traitor Legions fled into the Eye of Terror following Horus' defeat, and their Primarchs would sell their souls to Chaos, becoming Daemon Princes, each ruling a small Chaotic empire within the corrupted realms of the Eye of Terror.

Loss of the Primarchs
Today, all the Primarchs are either damned in servitude to the Gods of Chaos, lost to current knowledge of their whereabouts or dead. As mentioned before, Sanguinius died at the hands of his beloved brother Horus, who in turn later died at the hands of his father, the Emperor. Ferrus Manus, Primarch of the Iron Hands, died on Istvaan V at the start of the Horus Heresy. He was killed by his most beloved brother, the Primarch Fulgrim, who used the Sword of the Laer, a daemonic weapon that was corrupting his own mind to Chaos and that later possesed him to slay Manus. Fulgrim was later possessed entirely by the daemon (the Lord of Shadows) who resided within the blade. Rumours state that Ferrus Manus may currently be alive on Mars with the cybernetic assistance of the Adeptus Mechanicus. However the Mechanicum and the Iron Hands Chapter deny this to be true.

Over the next thousand years, the other remaining Loyalist Primarchs died or disappeared one by one. Lion El'Jonson of the Dark Angels returned to his homeworld of Caliban to find it in ruins, and the Dark Angel Marines he had left were 'corrupted' by the bitter Luther to rebellion. He led a strike force of his own Space Marines against the traitors on the surface, fighting with a burning hate towards his lost sons. The planet was being heavily bombarded, drastically weakening it so that when the Chaos Gods realized they had failed to claim the Lion, they unleashed a Warp storm of massive power and size. All that was left of Caliban's surface was the Tower of Angels and The Rock, the Dark Angels' former stronghold, with the rest being either destroyed or sucked into the Warp. When the Dark Angel Marines got to the Tower of Angels, all they found was the body of Luther. The Lion was nowhere to be found. But some say that he is asleep inside The Rock (the floating remains of Caliban turned into a Battle Fortress) with the Watchers of the Dark that are healing his injuries. Some Dark Angel Marines say he will return to lead them again. This would explain why Cypher, the fallen Angel who has avoided capture time and again, has a special sword with him that he does not use in combat. This blade is believed to be the Lion's sword, and the truth of its origins would be one of the first questions the Dark Angels would love to ask their most elusive of Fallen brothers.

Jaghatai Khan of the White Scars disappeared through a Dark Eldar Warp portal whilst he was pursuing them after a raid on the White Scar homeworld. Rumors abound that he was captured whilst lost in the twisting paths of the Dark Eldar Webway.

Leman Russ of the Space Wolves is one of the Primarchs whose disappearance appears to be voluntary. The Space Wolves hold a legend that says Russ went on a quest to find a means to cure the Emperor with the fruit from the mystical Tree of Life, but the truth is likely to be far more complex. Others have said that Russ traveled to the Eye of Terror, to lead his lost 13th Company against Magnus the Red and the Thousand Sons. (However the new story is that he himself was dying and that he shall return for the Wolftime to lead his brothers once more.)

Rogal Dorn of the Imperial Fists died fighting on the bridge of the Chaos Despoiler-class Battleship Sword of Sacrilege alongside a company of his sons after he led a contingent of Imperial Fists in an attack on an early Black Crusade fleet with a vastly outnumbered force in the hopes of delaying the Chaotic assault upon the Imperium until reinforcements could arrive. He was one of the last Primarchs to die after the end of the Horus Heresy. His skeletal remains, weapons and Power Armour were recovered from the wreck, even as most of the Chaos starship was destroyed during the conflict. Today, Dorn's skeletal fists have been separated from the rest of his remains and are housed in the holiest shrine of the Imperial Fists Chapter onboard their mobile fortress-monastery the Phalanx, preserved in stasis for all time and inscribed with the names of every Imperial Fists Chapter Master to have led the sons of Dorn since his death. Only a Chapter Master has the right to inscribe his name and heraldry upon their sacred bones. At the same time, Dorn's skeletal corpse, without the hands, was also placed by the Imperial Fists within another chapel on the Phalanx, embedded within a block of clear amber that has been contoured to match the body's form.

Roboute Guilliman of the Ultramarines met his end slowly after fighting his former brother Fulgrim, following a slash across his throat with a corrupted blade which later poisoned him, the legendary sword Anathema that nearly killed his brother Horus. Today, his body lies at the heart of the Ultramarines' Temple of Correction, maintained in a stasis field to preserve it. He is the only Loyalist Primarch to still exist, in some physical sense, in the entire Imperium. His sons and billions of pilgrims are blessed individuals each year, able to experience the awe-inspiring sight of such a holy figure as one of the Emperor's own sons, the bleeding wounds he sustained still vividly visible upon his neck and chest. Legend among the Ultramarines is that the stasis field is having a unique effect upon the Primarch: that his wound is slowly healing, in spite of the impossibility of such a thing while in stasis.

There is little known about how Vulkan of the Salamanders disappeared. As far as it is known, he vanished into thin air around a thousand years after the Horus Heresy. Rumours say he died on Isstvan V, however he was later present at the Imperial Palace when Guilliman divided the Space Marine Legions at the Second Founding. The Salamanders Chapter believes that after the Forgefather finds all nine relics around the galaxy, Vulkan will return to lead the Salamanders to victory against the Traitor Legions of Chaos.

Corax of the Raven Guard's end was tainted by guilt and shame. In order to rebuild the strength of his sons from the destruction of Istvaan V, Corax accelerated the growth of his Legion's gene-seed organs, producing more of them but also deteriorating them rapidly, causing many aspirants to become hulking mutants. Filled with despair and shame, he personally gave each degenerated Battle-Brother the Emperor's Peace. Riddled with guilt over what he had done to save his Legion, Corax locked himself away within his sanctum, the Raven's Tower, for a year. On the anniversary date of his self-imposed exile, he left his tower, haggard and gaunt, and took a small shuttlecraft. It was last monitored as setting a course for the Eye of Terror, the realm of the Chaos Gods. He left only a single word as his legacy - "Nevermore."

Of all the Primarchs, excepting those missing or still present in unique conditions like Roboute Guilliman, only the damned Primarchs of Chaos live today, although to say that they truly live is a gross misstatement since their bodies, minds and souls now exist exclusively within the power of Chaos.

Traitors

 * The Warmaster Horus of the Sons of Horus was killed by the Emperor of Mankind aboard his own battle barge and flagship, the Vengeful Spirit, in orbit above Terra at the end of the Battle of Terra and his soul in the Warp was obliterated by the fully unleashed psychic power of the Emperor's mind. His corpse was later completely destroyed by the Chaos Lord Abaddon the Despoiler, who took Horus' place as the overall leader and Warmaster of the Forces of Chaos and the master of the Black Legion, the former Sons of Horus.
 * Magnus the Red of the Thousand Sons rose to become a Daemon Prince of Tzeentch and the master of the Planet of the Sorcerers within the Eye of Terror.
 * Angron of the World Eaters ultimately was transformed into a Daemon Prince of Khorne.
 * Mortarion of the Death Guard became a Daemon Prince of Nurgle.
 * Fulgrim of the Emperor's Children became a Daemon Prince of Slaanesh.
 * Lorgar of the Word Bearers served Chaos directly and so was transformed into a Daemon Prince of Chaos Undivided, the master of the Daemon World of Sicarus within the Eye of Terror, an unholy world dedicated to spreading the worship of the Ruinous Powers across the galaxy.
 * Perturabo of the Iron Warriors was also transformed into a Daemon Prince of Chaos Undivided.
 * Konrad Curze, also known as Night Haunter, was assassinated by the Callidus Temple Assassin M'Shen. He allowed her infiltration, apparently wanting to die to be freed of the stain on his soul imposed by his own life-long brutality.
 * Alpharius of the Alpha Legion was killed by Roboute Guilliman, but the source which reported his death may have been manipulated by one of the Legion's schemes. It is not known if Alpharius or his identical twin brother Omegon was the Primarch killed in the report. Due to the report's unreliability, neither may have been killed, or only one may have been killed. The only truth is that the Alpha Legion is still led by at least one of its Primarchs.

Loyalists

 * Ferrus Manus of the Iron Hands was killed at the Drop Site Massacre on Istvaan V at the start of the Horus Heresy by Fulgrim of the Emperor's Children who presented his head to Horus.
 * Sanguinius of the Blood Angels was slain by Horus on the bridge of his Battle Barge and flagship Vengeful Spirit in orbit above Terra at the end of the Battle of Terra and the siege of the Imperial Palace after refusing to join him and serve the Ruinous Powers of Chaos.
 * Lion El'Jonson of the Dark Angels returned to his homeworld of Caliban only to discover that his friend and second-in command Luther and the Dark Angel garrison left on their homeworld had turned against him and chosen to serve Chaos. He led a strike force of his own Loyalist Dark Angels against the Traitors, who were called the Fallen Angels. He disappeared amongst the inferno as the world was blasted apart by a Warp Storm caused by the Fallen Angels' adherence to Chaos and a powerful bombardment from his ships in orbit. He sleeps deep within the Rock, the biggest remaining piece of Caliban and the current mobile fortress-monastery of the Dark Angels. Only the Emperor and the Watchers in the Dark know of this great secret--a Primarch still lives.
 * Jaghatai Khan of the White Scars disappeared while pursuing Dark Eldar pirates into a Webway portal after they had managed to raid the world of Mundus Planus. There are rumours that he fights there still against the Dark Eldar, lost in the twisting paths of the Webway. After nine thousand years, it seems highly unlikely, but not impossible that Jaghatai Khan still lives.
 * Leman Russ of the Space Wolves disappeared into the Eye of Terror. The Space Wolves have a legend that says Russ went on a quest to find a means to cure the Emperor and restore him to full consciousness. His final words before his disappearance indicate that he would return during the Wolftime (the Last Battle between Order and Chaos). It is also said that Leman Russ led the 13th Company of the Space Wolves into the Eye of Terror and ordered them to hunt down the Traitor Legions which had fled into that vast Warp rift, particularly the Thousand Sons, the Space Wolves' most hated adversaries.
 * Rogal Dorn of the Imperial Fists died fighting on the bridge of the Chaos Despoiler-class Battleship Sword of Sacrilege alongside a company of his sons after he led a contingent of Imperial Fists in an attack on an early Black Crusade fleet with a vastly outnumbered force. He had launched the hopeless assault in the hopes of delaying the Chaotic assault upon the Imperium until reinforcements could arrive. He died long after many of his Loyalist brother Primarchs had already passed on. His skeletal remains, weapons and Power Armour were recovered from the wreck, even as most of the Chaos starship was destroyed during the conflict. Today, Dorn's skeletal fists have been separated from the rest of his remains and are housed in the holiest shrine of the Imperial Fists Chapter onboard their mobile fortress-monastery the Phalanx, preserved in stasis for all time and inscribed with the names of every Imperial Fists Chapter Master to have led the sons of Dorn since his death. Only a Chapter Master has the right to inscribe his name and heraldry upon their sacred bones. At the same time, Dorn's skeletal corpse, without the hands, was also placed by the Imperial Fists within another chapel on the Phalanx, embedded within a block of clear amber that has been contoured to match the body's form.
 * Roboute Guilliman of the Ultramarines was struck down with an envenomed Chaos blade by his brother Primarch Fulgrim. His body is perfectly preserved in a stasis field at the heart of the Temple of Correction on the world of Macragge. It is rumoured that he is still alive and that his wound is slowly healing, something considered physically impossible in a stasis field. The truth of this rumour is unknown but this is seen by many (including the Ultramarines Captain Uriel Ventris) as mere wishful thinking.
 * Vulkan of the Salamanders disappeared. The position of Chapter Master, filled by the Captain of the 1st Company of the Salamanders ever since, is considered to be a regency as the Salamanders believe that Vulkan will one day return and lead them on a great crusade against Chaos.
 * Corax of the Raven Guard was racked by guilt and shame for what had happened to his Chapter when he had approved the use of heretical genetic manipulation in order to rapidly increase the numbers of the shattered Raven Guard after the Drop Site Massacre. In order to rebuild quickly the strength of his Legion from the Dropsite Massacre on Isstvan V, Corax had ordered the Raven Guard's Apothecaries to accelerate the growth of the Legion's gene-seed organs, producing more Space Marines than the process normally allowed, but these changes also degenerated or mutated the Legion's gene-seed, causing many Raven Guard Neophytes to become hulking, mutant monsters. Riddled with guilt over what he had done, Corax euthanised all of the mutated Astartes and then locked himself away within his sanctum, the Raven's Tower. Exactly one year later he left his tower, haggard and gaunt, and took a small shuttlecraft equipped with a Warp-Drive into the Immaterium with the words, "Never more." Corax's shuttle was last monitored setting a course through the Warp for the Eye of Terror. Corax's final fate remains unknown, though the Astartes of the Raven Guard and its Successor Chapters believe their Primarch still lives.

Unknown Primarchs
Almost nothing is known about the two unknown Primarchs. References to the second and eleventh Primarchs are made in the short story, "The Lightning Tower," in which Rogal Dorn explains that the plinths on which their statues stand should be vacant and says that "no one ever spoke of those two absent brothers. Their separate tragedies had seemed like aberrations. Had they, in fact, been warnings that no one had heeded?" The Traitor Primarchs' statues in this story are covered with a shroud, so the fate of the second and eleventh is undetermined. They may have been found and a tragedy befell them as the story implies they were spoken about posthumously.