The Warhammer 40,000 Codex books contain the complete rules for playing various armies in Warhammer 40,000. They also contain in-depth painting guides, army lists, and much more. Codex Ultramarines contains History of the Ultramarines Chapter in the Warhammer 40,000 Universe, the structure of the companies of the chapter, their special rules and army list. Also provides painting guides for models of the Ultramarines and many other generic Space Marine Chapters. This version was released at the time of the second edition of Warhammer 40,000. Contributor's Description.