The Legio Interfector ("Murder Lords") is a Traitor Titan Legion of the Dark Mechanicum in the service of Chaos. Formerly known as the "Lords of Valour", the Legio Interfector was a young Titan Legion, raised from the Forge World of Valeous II during the first years of the Great Crusade.

During that most august undertaking, the Lords of Valour acquitted themselves with honour and bravery, adding numerous campaign triumphs to their war banners.

All that changed on Istvaan III, when they were subverted to the will of the Warmaster Horus. After that dark day, the Legio Interfector were known by a new name: the Murder Lords.

Madness has taken root within the ranks of the Legio Interfector. Those princeps not purged by the Warmaster during the Heresy have been driven insane by the knowledge of their deeds, turning in desperation to the voices whispering in their mind.

Legion History

"If the hallowed Legio made us into giants, then it was the will of the Warmaster that made us gods."

— Princeps Seniores Aedurn Kaum, Legio Interfector
Murder Lords Warlord Titan

Legio Interfector colour scheme as displayed by the Warlord-class Titan Abhorrent.

The Legio Interfector is known to have supported an effort made by the Word Bearers splinter warband, the Foresworn, led by the Daemon Prince Kor Megron, to topple the Shrine World of Eydolim.

During the days of the Great Crusade, a company of the Word Bearers Legion under the command of Kor Megron was stationed on Eydolim to assist human colonists in settling the planet.

As was customary for them, the Word Bearers spread amongst the populace the belief that the Emperor of Mankind was a god incarnate -- a creed directly conflicting with the atheistic Imperial Truth, which was the official doctrine of the Imperium in that era.

When the company turned to the worship of Chaos alongside the rest of its Legion following the Pilgrimage of Lorgar, Kor Megron and his followers swore that their great work would not be complete until every last icon of the False Emperor was cast down and the Imperium itself no more than a distant memory. Each sealed this pact with blood and they anointed themselves as "the Foresworn."

They continued on this quest throughout the millennia after the end of the Horus Heresy, though their greatest goal had always eluded them -- the undoing of the magnificent works they had done on Eydolim in their former veneration of the Emperor.

To this end, in 946.M41 the Foresworn assembled a force of several Chaos Space Marine warbands -- the Red Corsairs, splinter warbands from the Black Legion, the Iron Warriors, the Night Lords and the World Eaters Legions, and secured the support of Dark Mechanicus Traitor Titans.

The Iron Warriors and Red Corsairs forces struck at Lector's Lowell, a Forge World located in the same star system as Eydolim, hoping to plunder the vast resources of the world's weaponariums for which the planet was rightly famed.

The forgemasters of Lector's Lowell were aware of the incoming Chaos assault, and rallied their Skitarii regiments to defend the world.

Soon after the Chaos Space Marines made planetfall, however, it became apparent that the Forge World stood little chance, as the Heretics were supported by the Traitor Titans of the Legio Interfector, a force the Skitarii could not hope to counter. Lector's Lowell was in dire straits.

In response to attacks carried out throughout the system, a sizable portion of Crusade Group Black Gate was diverted from its original assignment to support Imperial efforts in the Damocles Gulf to defend the world of Eydolim.

Units of the contingent, including nine regiments of Cadian Shock Troops as well as smaller dispositions of other Astra Militarum regiments, bolstered the undermanned Planetary Defence Force, and its grateful marshal offered overall command to the far more experienced Cadian commanding officer, who accepted the commission with humility.

Eventually, the Heretic Astartes made planetfall, and steadily pushed Imperial forces back, overcoming all resistance, until they finally reached the capital city of the world. Outmatched at every turn, the defenders looked to the heavens in desperation -- and beheld a miracle. The scions of Ultramar had arrived.

While fighting the aliens of the T'au Empire, the Ultramarines 2nd Company and a force of 1st Company Veterans accompanying them received orders from their Chapter Master, Marneus Calgar, to relocate to Eydolim.

Interfector Titan

A Legio Interfector Reaver-class Titan.

Captain Cato Sicarius, with barely disguised enthusiasm, hastily diverted his force. Aboard the Strike Cruiser Valin's Revenge, the Ultramarines prepared to face their Traitor brethren. As the Heretics swarmed towards Eydol City, the Space Marines deployed their entire strength to support the Astra Militarum.

First contact between the Ultramarines forces and the Traitors took place in the munitorum district outside Eydol City. A small task force led by Epistolary Casmus daringly assaulted the Chaos Titans of the Legio Interfector which brazenly strode into the urbanised area, and succeeded in destroying one of those towering machines, in addition to damaging several others. This Imperial task force retreated only when a unit of the Red Corsairs moved to clear them out.

The two forces proceeded to clash in the climactic engagement of the campaign, the Battle of Eagle Gate. Eagle Gate was the sentinel of the city of Eydol's east road, the central point of an imposing curtain wall.

Reinforced with plascrete and bristling with automated turrets, it was a redoubt which no attacker had penetrated in the past, and yet during the Battle of Eagle Gate it was breached in several places -- long range bombardment tearing holes in its right flank, Titans of the Legio Interfector blasting great chunks from the walls on the left flank, and Khornate Space Marines supported by the Foresworn hurling the gates themselves open.

At the end, the wrath of the Foresworn and their allies was halted before the Gate of Martyrs -- the great eastern portal of Eydol City. There, the remnants of the Imperial forces made their last stand as Kor Megron hurled himself at the defenders, eager to slaughter them all.

Cato Sicarius stood defiantly before him as the Daemon Prince brought his weapon down in foul sweeps, battering the Space Marine captain with such ferocity that his knees buckled and his finely crafted Power Sword was notched and chipped.

Kor Megron stomped Sicarius to the ground and raised his weapon triumphantly. The final blow never came, however, as a lone Imperial Guardsman, upon witnessing the dire straits the captain was in, hurled himself at the daemonic monstrosity, careless for his own safety, and pierced the Word Bearer's flesh with his bayonet.

Kor Megron turned his attention to the brave soldier, and burned his body in a burst of Warpflame. This distraction allowed Sicarius to act, and he hastily thrust his sword upwards, piercing the Daemon Prince's breastplate and driving the blade into his corrupted heart. With a deafening scream, Kor Megron was banished to the Warp.

Disoriented by the loss of their leader, and worn to the breaking point by the Imperial defenders, the Chaos forces began to fall back. For the Imperium, a reprieve had been bought at great cost. For the legions of Chaos, there would be another reckoning...

Notable Campaigns


A Warhound-class Titan of the Legio Intefector in combat at the Battle of Molech during the Horus Heresy.

  • Battle of Molech (009.M31) - Molech was a Knight World ruled over by House Devine ever since the Emperor Himself led an expedition to bring it into the fledgling Imperium and left a significant garrison there. The planet thrived under the rule of Devine, the populace of its capital city of Lupercalia never knowing the true reason why the Emperor had taken it upon Himself to lead the force that claimed it. Unfortunately for the citizens of Molech, the traitor Horus knew exactly what lay beneath the city that had been name in his honour -- a Warp Gate which, it was said, had allowed the Emperor to convene with the Ruinous Powers themselves. When Loyalist forces became aware of the Traitor fleet's approach, they mustered at Molech. As well as a trio of Titan Legions -- the Legio Gryphonicus, Legio Crucius, and Legio Fortidus -- there were elements of each of the Imperium's fighting forces, including nearly a dozen Knight Houses which owed fealty to Devine. The Traitor force was equally impressive, featuring no fewer than four Titan Legions: the Legio Vulpa, Legio Interfector, Legio Vulcanum I, and the infamous Legio Mortis. As the Warmaster unleashed a massive coordinated assault, the planet's defenders were thrown into disarray when the Plasma Reactor of an Imperator-class Titan was destroyed. Thousands of Loyalists were immolated in a blinding flash as a miniature sun erupted from the Titan's core to leave a smoking crater half a Terran mile wide. In the wake of the catastrophic blast, the spearhead of Traitor Titans marched through the gap in the Imperial lines. At the height of the battle, House Devine revealed its true allegiance to the Warmaster, its treachery unveiled at a pivotal moment, heralding a slaughter from which only a handful of Loyalists escaped. Caught between the treacherous Knights of House Devine and Horus' rampant forces, the shattered remnants of Molech's defenders were slaughtered without mercy. They were totally defeated, so brutally that only one in a hundred of the troops of the Imperial Army survived the campaign. After his passage through the portal into the Realm of Chaos, Horus won the full blessing of the Ruinous Powers as their champion. His drive on Terra seemed unstoppable.
  • Battle of Beta-Garmon, "The Titandeath" (006-013.M31) - The Legio Interfector took part in the long and savage Beta-Garmon campaign, which included hundreds of war zones across dozens of worlds. During this conflict, the Legio Interfector was supported by the Knights of House Makabius. Even before the greater armies of the Warmaster Horus reached the star cluster, the battle lines had long since been drawn, and fighting had been going on for many Terran years. It was a cauldron of battle that would consume millions of lives before its end and see the demise of entire Titan Legions, earning this campaign the dire moniker of the "Titandeath." The Beta-Garmon Cluster, also known as the gateway to the throneworld of Terra, was the last hurdle that the Warmaster Horus' forces had to overcome before they reached the Imperium's capital world. Heavily fortified by the Loyalists, Beta-Garmon would become one of the greatest and bloodiest battles of the Horus Heresy, as well as one of the longest-lasting.
  • Iconoclasm of Eydolim (946.M41) - As recounted more fully above, the Legio Interfector supported the Foresworn splinter warband of the Word Bearers Legion in their quest to raze the Shrine World of Eydolim, which they helped to create millennia ago, in the days of the Great Crusade. The Murder Lords took part in a number of engagements throughout the campaign, including an invasion of the Forge World Lector's Lowell, and the final assault on Eydol City, the capital of Eydolim, where the Chaos forces were ultimately thrown back.

Combat Doctrine

When the Legio Interfector sided with the Arch-traitor Horus, they did not fully understand the powers behind the Warmaster's rebellion. As the Legion fell under the influence of the Ruinous Powers, madness took root within the ranks of the Legio Interfector.

Those princeps not purged by the Warmaster during the opening years of the Horus Heresy were driven insane by the knowledge of their deeds, turning in desperation to the voices whispering in their mind.

In battle, gibbering prayers of darkness and murder spill forth from the Legion's Titans, their war sirens broadcasting the insanity of the crew within. In battle, Legio Interfector Titans can scream out this stream of corrupting static from their war sirens, overwhelming their enemies with madness.

The roots of Chaos have dug deep into the wreckage of the Legio Interfector's Titans. Daemonic energies coil around the Machine Spirits of their god-engines, driving them to extremes of rage and madness.

Legion Specific Wargear

  • Static Rounds - The forges of Valeous II were once known for their extensive use of static technologies, weapons created to disrupt and destroy energy barriers. The Legion can still call upon great stores of these weapons, though their shells are now covered in profane Chaos icons to guide their flight.

Notable Titans

  • Abhorrent (Warlord-class Titan) - The Abhorrent was once known as the Exemplar, a name gifted to it after its heroic actions during the Great Crusade. When the Legio Interfector was forced to side with the Warmaster Horus, their centuries of valour were cast aside. This very act drove most of Interfector's Titans mad, twisting their Machine Spirits until they stood as nothing more than pale mockeries of their former selves. Whether out of acceptance or shame for their new path, the Exemplar took a new name as the Legion fought to tear down everything it once helped build.
  • Sin of Commission (Warlord-class Titan) - Sin of Commission was one of the Legion's Titans supporting the Iron Warriors and Red Corsairs warbands in their attack on the Forge World Lector's Lowell, which was a stepping stone to the eventual invasion of the Shrine World of Eydolim in the same star system. The presence of Traitor Titans rendered the forgemasters of the world hopeless, as the Skitarii regiments available to them could not possibly fend off the god machines.
  • Fire of Betrayal (Reaver-class Titan) - The sheer ferocity exhibited by the Legio Interfector during the latter years of the Horus Heresy was in stark contrast to their past record. Warhound Titans of the Legion, such as the Face of Betrayal, became infamous for their cruel tactics. Small groups of Interfector Warhounds armed with Inferno Guns would set entire city blocks ablaze in order to divert their foes' attention away from the front line. Such tactics proved effective against the more honourable Titan Legions, who valued the lives of innocents, a virtue the Legio Interfector once possessed themselves.
  • Pax Ascerbus (Reaver-class Titan) - Pax Ascerbus was a corrupted Reaver-class Titan which called itself Teratus and was destroyed by a Legio Fortidus Titan during the Horus Heresy at the Battle of Molech.
  • Silence of Death (Reaver-class Titan) - Silence of Death was a Reaver-class Titan which was destroyed by a Loyalist Imperial Knights during the Horus Heresy at the Battle of Molech.
  • Soulmauler (Reaver-class Titan) - Soulmauler was a Reaver-class Titan which was destroyed in the munitorum district outside of Eydol City, the capital of Eydolim, by Space Marines of the Ultramarines' 2nd Company. Several other Titans, amongst them the Purge Master, had been crippled by similar assaults.
  • Bloodweil (Warhound-class Titan) - Bloodweil was a Warhound-class Titan which fought during the Horus Heresy at the Battle of Molech.
  • Lochon (Warhound-class Titan) - Lochon was a Warhound-class Titan which fought during the Horus Heresy at the Battle of Molech.

Notable Legion Personnel

None listed in current Imperial records.

Legion Appearance

Legion Colours

The colours of the Legio Interfector were originally black with red trim and white flames, but after its fall to Chaos this changed to dark red with decoration in bronze.

Legion Badge

The Legio Interfector's badge is a stylised, blood-spattered circlet with a black-bladed Flamberge -- a sword with a wavy blade -- pointed downwards. A small white skull icon is situated on the sword's crossguard.


  • Adeptus Titanicus - The Horus Heresy: Doom of Molech (Specialty Game), pg. 16
  • Adeptus Titanicus - The Horus Heresy: Rulebook (Specialty Game), pg. 15
  • Adeptus Titanicus - The Horus Heresy: Titandeath (Specialty Game), pg. 95
  • Adeptus Titanicus - The Horus Heresy: Doom of Molech (Specialty Game), pp. 26-28
  • Warhammer 40,000 Rulebook (6th Edition), pp. 384-393, 399
  • Vengeful Spirit (Novel) by Graham McNeill, Chs. 14, 20
  • Warhammer Community - What is the Battle of Molech?


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