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: Eldar (2nd Edition) is an expansion book for the Games Workshop tabletop game Warhammer 40,000. This book was published for the first time in 1994, and is for the 2nd Edition of Warhammer 40,000. The book has 96 pages and the cover is printed in color while the majority of the book remains in black and white, although there are usually several pages of colour images of miniatures.