Many of the Space Marine legions turned traitor alongside the Warmaster Horus ten thousand years ago. In the time since then, more have turned renegade in service to the Ruinous Powers. With all of the skill of their Adeptus Astartes cousins but none of their discipline and restraint, Traitor Space Marines are a terrifying force to send on special missions, and they’re even more effective when backed up by hordes of crazed Cultists who bend to their every whim.