Discover the siege of Kol, a cursed world where the Legio Custodes fought an epic, untold campaign against heretical cults, traitorous forces, and Warp-spawned horrors. This essential tome introduces devastating new rules for Slaanesh's daemonic forces, an immersive Legendary Mission centered on the disgraced Shield-Captain Medraut's assault through Kol's twisted underground hive complexes, two formidable new Custodian Proconsul units, and enhanced rules for elite Gyrfalcon Jetbike squadrons.