The Book of Desolation is a new expansion for Necromunda which furthers the narrative and fills out Hive Secundus with exciting new rules for four gangs: advanced Spyre Hunters, Secundan Incursion Gangs, the Malstrain, and Malstrain Corrupted Gangs. There is a comprehensive multiplayer Underhells Campaign, new Underhells Scenarios, additional rules for the Abyssal Ferryman Teams who offer assistance to those exploring Hive Secundus, new Dramatis Personae, rules for Custom Rigs using the Cargo-8 Ridgehauler chassis, and the Trazior Pattern Sentry Gun.