The Core Manual is a 208-page softback book which contains complete rules for choosing and constructing a kill team from 16 factions in the Warhammer 40,000 range (Adeptus Astartes, Deathwatch, Grey Knights, Astra Militarum, Adeptus Mechanicus, Heretic Astartes, Death Guard, Thousand Sons, Asuryani, Drukhari, Harlequins, Necrons, Orks, T’au Empire, Tyranids and Genestealer Cults)