Warhammer 40,000 (6th Edition): Deathwatch Codex Adeptus Astartes

SUFFER NOT THE ALIEN TO LIVE

The battle-brothers of the Deathwatch are the foremost xenos hunters in the Imperium. They are a black-clad brotherhood of noble warriors, bound by ancient oaths to defend Mankind from the alien, no matter its form. Hand-picked from the breadth of the Adeptus Astartes for their expertise in the slaughter of xenos threats, each of those who have joined the Long Vigil is a hero, tempered in the furnace of conflict and girded for battle with an arsenal of specialist weaponry. When the Watch Companies of the Deathwatch go to war en masse, there is no alien in the expanse of the galaxy that they cannot overcome.