Each of the two volumes describe the background and associated rules for a pair of antagonistic Chaos gods but each also had material that was germane to Chaos in general in the game settings. It consists of the 1988 book Slaves to Darkness and the 1990 follow-up The Lost and the Damned. The hardback books contain background material and rules for Warhammer Fantasy Roleplay (1st edition), Warhammer 40,000: Rogue Trader and Warhammer Fantasy Battle (3rd edition). The first version of Realm of Chaos is a two-volume publication by Games Workshop concerning the forces of Chaos. 4.3 Differences between Chaos Space Marines and Space Marines.
