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House Col'Khak, known also as the Suzerain House of Col'Khak or The Col'Khak Collective, is an alliance of Imperial Knight houses of the Questor Mechanicus. Col'Khak was founded in the late 30th Millennium during the Great Crusade on the frigid Agri-world of Atar-Planitia in support of the then-recently implanted Forge World of Atar-Median.

As such, the Collective owed its fealty first to the ancient Mechanicum -- through its bonded Forge World of Atar-Median -- and second to the Imperium.


House Cohl'Khak Cerastus Knight-Atrapos Omissiah's Will

Since its inception in the early years of the Great Crusade, the Col'Khak Collective has followed the strictures of the Sidon Protocols, effectively bonding it to the Atar-Median Forge World. The warriors of Col'Khak trained to function flawlessly alongside the Atar-Median Taghmata and the Titans of the Legio Atarus ("Firebrands"), and have benefitted from the continuous supply of Magaera and Styrix pattern Knight armours from the forges of Atar-Median.

Founded upon the frigid world of Atar-Planitia to serve alongside the newly-founded Forge World of Atar-Median, the Knights of House Col'Khak were forever bound in service to both the Legio Atarus and the Omnissiah Himself. Like Atar-Median, House Col'Khak was formed by those dispatched from Phaeton to avoid the divestiture of its power to Mars.

From their inception, the warriors of House Col'Khak were trained to function flawlessly alongside the Taghmata forces of Atar-Median and the Titans of the Legio Atarus, moulding the three militant arms of the Forge World into a fighting force of much repute.

This unbreakable bond ensured that only rarely did House Col'Khak take to the field of battle alone and, when mustered alongside their allies, full authority over the assembled Knights was often divested to the commanding archmagos prelate or Princeps.

The devotion of House Col'Khak to the ideals of the ancient Mechanicum and veneration of the Omnissiah extended far beyond the field of battle. Like many Knight Worlds tightly bound to a Forge World, the rites and practices of the Cult Mechanicus were readily accepted by the house. All within its ranks displayed extreme reverence for the technological artefacts given into the care of the household, be that a simple token of service or the Knight armours themselves.

In accordance with their continuedallegiance, House Col'Khak was gifted greater numbers of rare technologies than many Knight houses, the most notable being their ability to field entire formations of rarer pattern armours such as the Knight Styrix.

The pitiless thrall-Knights of House Col'Khak were renowned for fielding entire formations of these machines in support of the Legio Atarus, sweeping clear enemy infantry from the Titan's feet in a furious blast of energy beams and cleansing radiation.

Indeed, the warriors of Col'Khak have long since adapted many of the rites and practices of the Cult Mechanicus for their own use, treating all technological artefacts as precious relics and heirlooms of the Collective. Many even voluntarily accept extensive levels of cybernetic augmentation, although aesthetically choose to remain Human in overall appearance.

It is said that many of the oldest scions of Col'Khak are little more than preserved cerebral matter and life support systems. Outside their Knight armour, they appear as almost animate statuary to some in the most extreme cases, their gilded and argent plated bodies matching an ideal of human form.

The bond House Col'Khak maintained with the Legio Atarus saw the house deployed to Isstvan V, their warriors amongst the first to bring the Traitors to battle. Like their liege lords, the supporting Knights of Col'Khak were destroyed upon the world, slaughtered by the dishonourable hand of treachery.

It was this act that saw the warriors of House Col'Khak clamour for deployment alongside the maniples of the Legio Atarus and several detachments were even deployed in absence of the god-engines.

Though a rare sight during the Great Crusade, the independent deployment of House Col'Khak increased in frequency during the Horus Heresy to match the demands of the cataclysmic civil war.

Eager to seek revenge for those brethren slain in the opening moves of Horus' rebellion, the warriors of Col'Khak took to this role with ease, disseminating amongst the stars in search of Traitors to purge in the Omnissiah's name.

Notable Campaigns

  • Drop Site Massacre of Istvaan V (566.006.M31) - The Col'Khak Collective dispatched a full supporting cadre of Knights in assistance to a Legio Atarus demi-Legio sent to support the Loyalist assault on Istvaan V. All were subsequently lost alongside the Titans of the Red Naga War Maniple. The warriors of Col'Khak swore revenge on the Traitors and were most eager to join the battle against the Traitor forces of Warmaster Horus.
  • Battle of Beta-Garmon, "The Titandeath" (006-013.M31) - House Col'Khak took part in the long and savage Beta-Garmon campaign, which included hundreds of war zones across dozens of worlds. During this conflict, House Col'Khak provided Knight support to the Legio Atarus. 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.
  • Cataclysm of Iron (010.M31) - Across border sectors of the Segmentum Tempestus and the Segmentum Pacificus are located numerous lesser Forge Worlds known collectively as the "Belt of Iron". Since the sundering of the Imperium, many declared for the Traitor cause at the engineering of the Fabricator-General of Mars, while others remained loyal to Terra or sought to remain as aloof as possible from the conflict. Strife and tentative conflict between these once-aligned worlds erupted into full-scale war in 010.M31, pitching the Mars-aligned Forge Worlds of Incunabula, Urdesh, Valia-Maximal and Kalibrax against the forces of the Loyalist worlds of Graia, Arl'yeth and Atar-Median, while Arachnis and Jerulas Station both fell into civil war. The resulting conflict, that later becomes known as the "Cataclysm of Iron", sees the forge lords, their armies and allied Titan Legions and Knight Houses turn on each other in protracted warfare, with scores of human-inhabited worlds in the region suffering as they become the battlegrounds upon which they fight.
  • Battle of Ice World Tralsak (011.M31) - The shallow, frozen oceans of Tralsak are flash-boiled to steam by the fury of engine-war as full Household of Knights from House Col'Khak and Loyalist Titans of Legio Atarus and Legio Agravides clash with the Traitors of the Legio Magna and Legio Victorum as the Loyalist Shattered Legions and Traitor World Eaters fight across the disintegrating landscape of ice floes. Ultimately, outright victory eludes both sides, and each uses the cover of the world-enveloping fog thrown up by the destruction to extricate their forces and redeploy them elsewhere. Nevertheless, numerous supporting Knights of both sides remain to fight a war in which neither will concede defeat.

Notable Knights

  • Omnissiah's Will (Cerastus Knight-Atrapos) - A survivor of Isstvan V, Omnissiah's Will was piloted by the techno-savant Scion Mechanicum Ailaedus VII. On the eve of the Cataclysm of Iron's final campaign, Ailaedus had already sown a path of destruction across the Belt of Iron, the speed of his Knight armour and its potent weapons proving the end of numerous Battle Titans. A favoured tactic of Ailaedus and the Omnissiah's Will was to charge a pair of closely ranked enemy god-engines, cutting the legs out from under one of the Titans, so that it fell burning into the other enemy machine, destroying both.

Military Strength

The military strength of the Col'Khak Collective is currently unknown, though it is believed to conform widely to a Questoris-type Household. The Col'Khak are known to be extensively equipped with both the Magaera and the Styrix Pattern Questoris Armour, both manufactured continuously on Atar-Median, which leads to the conclusion that the Col'Khak Collective is regularly used as anti-infantry support for the Legio Atarus.

House Appearance

House Colours

The colours of House Col'Khak are red and black.

House Arms

House Col'Khak's coat of arms is not listed in current Imperial records.

House Personal Heraldry

There is no information in regards to personal heraldry for House Col'Khak Knights in current Imperial records.


  • Adeptus Titanicus - The Horus Heresy: Crucible of Retribution (Specialty Game), pp. 60-61
  • Adeptus Titanicus - The Horus Heresy: Rulebook (Specialty Game), pp. 16, 74
  • Adeptus Titanicus - The Horus Heresy: Titandeath (Specialty Game), pg. 93
  • The Horus Heresy Book Four: Conquest (Forge World Series) by Alan Bligh, pp. 98-99