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The '''Doom Legion''' is a [[Space Marine Chapter]] of [[Ultramarines]] descent. A majority of the Chapter was corrupted into the [[Chaos Space Marine]] warband known as the [[Vectors of Pox]] during the [[Abyssal Crusade]] in [[M37]].{{Fn|4}}

The Doom Legion was responsible for maintenance and garrison of the ''[[Faithful's Deliverance]]'', the pre-[[Horus Heresy|Heresy]] star fortress that overlooks the notorious [[Elusian Maze]] asteroid fields. Few other [[Chapter|Space Marine Chapters]] could boast space-borne firepower of this magnitude.{{Fn|2a}} The Chapter's homeworld is the [[Artificial World|artificial planet]] of [[Elusia Prime]].{{Fn|2b}} Over time, the Doom Legion was all but forgotten by the rest of the [[Imperium]], left in that distant outpost, fighting endless wars against the denizens of the accursed sector.{{Fn|4}}

===Partial corruption===

The Doom Legion was one of the thirty Chapters sentenced to the [[Abyssal Crusade]]. Because of their duty of watching over the Elusian Maze, only six [[Space Marine Company|companies]] took part in the [[Crusade]], instead of the entire Chapter. Five of these were corrupted into the [[Vectors of Pox]] warband. After the crusade, the [[Inquisition]] subjected the Doom Legion to rigorous examinations to seek for corruption, though found none.{{Fn|4}}

*Also during the [[13th Black Crusade]], the Doom Legion and [[Fire Lords]] came to the aid of the 4th [[Cadian]] army on the besieged [[Fortress World]] of [[Kasr Sonnen]].{{Fn|5}}

*A company of Doom Legion participated in the [[Xanatros Purgation]] alongside 3 [[Mordian Iron Guard]] regiments and [[Vincent Morrow|members]] of the [[Inquisition]]. Military actions were taken against the [[Genestealer Cult]] infesting the world of [[Xanatros]]. The Doom Legion took an unspecified number of casualties during this conflict.{{Fn|7a}}{{Fn|7b}}

==Chapter Elements==