The Book This 336-page hardback book is a treasure trove of lore, illustrations, and background information for the far-future setting of Warhammer: The Horus Heresy, with comprehensive guides to help you build and paint your collection of models. It also includes the core rules for reenacting the ferocious conflicts of the Age of Darkness with your own armies, and an explanation of different modes of play to suit any hobbyist.