Warhammer 40K: Tyrannic War
This 184-page hardback book is a Crusade expansion for Warhammer 40,000 that lays out the grim narrative of the Fourth Tyrannic War, along with all the rules you need to play narrative games, build and upgrade a Crusade army between games, and run your own campaigns – it also includes the full Warhammer 40,000 Core Rules module.