In Games Workshop's Warhammer Fantasy and Warhammer 40,000 fictional universes, Chaos refers to the parasitic entities which live in a different plane of reality, known as the Warp or Immaterium in Warhammer 40,000 and as the Realm of Chaos in Warhammer Age of Sigmar. The term can refer to these warp entities and their influence, the servants and worshippers of these entities, or even the parallel universe in which these entities are supposed to reside. The most powerful of these warp entities are those known as the Chaos Gods, also sometimes referred to as the Dark Gods, Ruinous Powers, or the Powers of Chaos. Similarities exist between the Warhammer idea of Chaos and the concept of Chaos from Michael Moorcock's Elric saga, which also influenced D&D's alignment system. Further similarities can be seen with the godlike extradimensional Great Old Ones of horror writer H. P. Lovecraft's stories.
