While the bulk of the Imperium is distracted elsewhere, the Iron Warriors launch their bid to control the region of space known as the Cadian Gate, where a few Imperial holdouts still resist despite the loss of Cadia. Holding this ravaged region is instrumental to their Primarch Perturabo’s wider plan for the Imperium, and the biggest obstacle in his way is the forge world of Agripinaa. This new set of expansion books for Warhammer 40,000 chronicles the latest wars in a new warzone – the Cadian Gate – with loads of in-depth background lore and new rules for fighting battles on these hellish landscapes. In addition to new Detachments for the Chaos Space Marines, Space Marines, Imperial Knights, Adeptus Mechanicus, and Chaos Knights, you also get a book of rules for fighting massive Apocalypse battles in which enormous armies duke it out with the biggest and deadliest weapons in their arsenals.