Learn about the battle on the cursed world of Kol, where the Legio Custodes waged a forgotten war against cultists, Traitors, and daemons of the Warp. The book also contains new rules for the daemonic legions of Slaanesh, a Legendary Mission recreating the dishonoured Shield-Captain Medraut’s attack on Kol’s corrupted subterranean hive city network, two new Custodian Proconsul units, and updated rules for Gyrfalcon Jetbike sodalities.