Inside this 104-page hardback book, you'll find:

Background material about the Chaos Knight Houses, including how they operate, and their infernal heraldry
Photography of massed Knight charges, and artwork that will set your imagination ablaze
Rules for using Chaos Knights in games of Warhammer 40,000, with four Detachments, and 11 datasheets to cover the available configurations
A set of rules for working out your own twisted narrative campaign

This book also contains a one-use code to unlock Codex: Chaos Knights content in Warhammer 40,000: The App.

This Codex is for the 10th Edition of Warhammer 40,000