From Lexicanum

The Doom Legion is a Space Marine chapter.

Marine	Basic Data	Chapter Symbol Miniature
	Name: Doom Legion Founding chapter: Unknown Founding: Unknown Chapter Master: Unknown Homeworld: Elusia Prime1 Fortress-Monastery: Unknown Main colours: Gunmetal armor with black pauldrons and green aguila and pauldron trim Specialty: Unknown Battle Cry: Unknown Estimated strength: Unknown

Background

All that is currently known of the Doom Legion is their name, the name of their homeworld, that the homeworld is situated within the Ultima Segmentum, and that their Chapter symbol is a skull.

The Doom Legion is Responsible for maintenance and garrison of the "Faithful's Deliverance", the pre-Heresy star fortress that overlooks the notorious Elusian Maze asteroid fields. Few other space marine chapters can boast spacebound firepower of this magnitude.²

Sources

• ¹:Warhammer 40,000 5th Edition Rulebook
• Codex: Space Marines (5th Edition)
• ²:Codex: Space Marines (5th Edition), p.30, p.28