In the fictional universe of Warhammer 40,000, the Legion of the Damned is a chapter of Space Marines which mysteriously appears to help overwhelmed Imperial forces, then vanishes just as mysteriously, leaving behind only the destruction which they have caused. The troops that make up the Legion of the Damned do not have strict uniform armour decoration like other Space Marine chapters. Instead, each marine has a variety of flame, bones, and skull motifs painted over their all-black armour