- 13th Black Crusade (999.M41) - The Extinction Angels joined the Black Legion for their assault on Demios Primary, where treachery rendered the orbital defences helpless to resist the Archenemy's onslaught. Their combined assault groups swept through the forges of the Adeptus Mechanicus, scattering the defending Skitarii Legions like chaff. The Titans of the Legio Astorum mobilised in defence of its fortress and gradually repelled the invaders. The loss of the Forge World's manufacturing capabilities proved a serious blow to the Imperial war effort and, solar weeks after the invasion, Extinction Angel units remained hidden in the depths of the Mechanicus facilities despite the arrival of a Black Templars Crusade Fleet to hunt them down.
The Extinction Angels possess a number of Chaos Space Marine Chosen known as the "Reapers." These cold killers are the most veteran warriors of the Extinction Angels warband. They have focused their studies to master the arts of melee combat, particularly working in conjunction against hardened targets.
To overcome such opposition, a band of these proven souls attempts to surround and overpower their foes, using cooperation, misdirection, and crushing blows with Power Weapons.
In cases where opponents are more numerous, the Reapers continue their pack-like approach, often herding foes to one another through cover during the melee.
The Extinction Angels' Power Armour is painted a dark purple with bone and gold details.
The Chapter's badge is a skull wearing a red hood, behind a grey Scythe.
- Black Crusade: Core Rulebook (RPG), pg. 57
- Codex: Chaos Space Marines (3rd Edition, 2nd Codex), pg. 76
- White Dwarf 287 (UK), "The Thirteenth Black Crusade: Death by a Thousand Cuts," pg. 38