Converted from Dawn of War: Soulstorm.
Chaos Space Marines are sometimes infected by Obliterator virus. Flesh of such Marines becomes fused with their armor and weapons tranforming the bearer into gruesome amalgam of flesh and metal.
Obliterators gain ability to literally grow weapons from their own body, which make them flexible fighters on the battlefield. Such Marines often leave their warbands forming Obliterator Cults. They serve as mercenaries in other chaos space marine forces, often taking archeotek or relic weapons as payment.
Dawn of War Conversion