'''Realm of Chaos''' was a two part series of books first created in 1988 and finished in 1990 for First Edition of Rogue Trader. The works discuss the four [[Gods of Chaos|deities of Chaos]] and the various aspects of [[Chaos]] and the [[Warp]]. The books were designed for both the Warhammer 40,000 Universe and the Warhammer Fantasy Universe.

This information as since been supersceededsuperseded, but still influences forms the way Chaos has been talked about basis for later background in Third and Fourth Edition, inspiring the Horus Heresy novels and the [[Liber Chaotica]] set of books.

''Slaves to Darkness'' discusses the nature of [[Khorne]] and [[Slaanesh]] and the . The ''Lost and the Damned'' was created later to discuss its companion book, dealing with [[Nurgle ]] and [[Tzeentch]].