The Invictors was a formerly Loyalist Space Marine Chapter of unknown Founding and origin. It was 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, the Invictors had become a Chaos Space Marine warband known as The Unhallowed.
Following the Ecclesiarchal Purges of 321.M37, a dozen star systems were engulfed by Warp Storm Dionys, its echoes rippling along the spiral arms of the galaxy as it raged through the Empyrean. Records of mutation and Chaos Cultist activity quadrupled overnight. Worse yet, it was not only the citizens who were affected by the sudden influx of Chaos. Many of the Space Marine Chapters with homeworlds affected by the Warp Storm found that the secret imperfections in their gene-seed were writ large upon their new recruits, giving rise to a wave of disturbing manifestations both physical and psychological. The Invictors were one such Loyalist Chapter of Astartes that had been affected by these Warp Storms.
When the Ecclesiarchy heard of this sinister tum of events, Saint Basillius the Elder demanded that all those Chapters of the Adeptus Astartes whose homeworlds had been touched by the Warp Storm be rendered unto his judgement. Such was the elder's influence with the High Lords of Terra that within a standard year this had come to pass. After a series of stringent tests and prognostications, hundreds of Chapters were deemed unaffected by the Warp Storm. No less than thirty were found wanting. The Judged, as these fallen Chapters came to be known, volunteered for a redemptive Penitent Crusade. The most militant of their number demanded the right to purify their tainted flesh in the fires of battle, to make a noble end from tragic misfortune. To the surprise of his closest advisors, Saint Basillius agreed to this proposal. He saw it fitting to send the accused into the Eye of Terror, taking the fight for the Imperium's future to the Daemon Worlds inhabited by the Traitor Marines.
A representative from each of the doomed Chapters held an emergency Council of Dismay to discuss the proposed Crusade. After scant hours of debate, they acquiesced to Basillius' demands, for they believed that martyrdom was preferable to an existence of suspicion and doubt. The last few days of 321.M37 saw a solemn procession of Strike Cruisers and Battle Barges pass through the Cadian Gate into the Eye of Terror, relay systems dormant and heraldic colours obscured by black mag-plates. One by one, the Chapters of The Judged disappeared into the iridescent dust nebulae that surrounded the Eye. As the massive Space Marine flotilla entered the Eye of Terror, they were set upon by a massive Chaos warfleet. The resultant battle was so fierce that the ships of The Judged were forced to retreat and were scattered to the furthest corners of the Eye.
Chapter after Chapter fell to the perils of the Eye, for the Abyssal Crusade had entered a hell from which very few individuals emerge unchanged. The true account of what occurred within the Eye to the Invictors is unknown, but most of the tales of the Chapters of The Judged ended in tragedy and sorrow. By the time they reemerged from the Eye many standard centuries later, the Invictors were no more, for they had become the Chaos Space Marine warband known as The Unhallowed, wholly dedicated to the service of the Ruinous Powers.
The Invictors' Chapter primarily wore purple Power Armour, which included the shoulder plate trim, helm, torso and legs. The Aquila or Imperialis on the chest plate, as well as the power pack, shoulder platess, and arms were black. The white squad specialty symbol -- (Tactical, Assault, Devastator or Veteran) -- was indicated on the right shoulder guard. A black Gothic numeral stenciled on the centre of the squad specialty symbol indicated squad number. The white Gothic numeral stenciled on the left knee guard indicated company number.
The Invictors' Chapter badge was a white sword, with the tip pointed downwards, surrounded by a white Iron Halo, on a field of black.
- Adeptus Astartes: Successor Chapters (Limited Release Booklet)
- Chapter Approved 2001 - Second Book of the Astronomican, pg. 117
- Codex: Chaos Space Marines (6th Edition), pg. 19