As guilliman begins his indomitus crusade, he must first secure the ultramar system. With his new primaris marines he sets out too take back the planet of Tarvan, but little does he know that chaos is not the only threat. Ghazghkull mag uruk thraka HAS appeared with his great Waaagh. In a confrontation between the son of the emperor and the profit of gork and mork is coming and only one can be victorious.