The once noble tribes of Ursungorod in Ghur have almost entirely fallen to Chaos, and an infestation of Clans Pestilens skaven has amassed in the caverns beneath the snowy tundra. There, Poxmaster Felk is on the brink of opening a vital realmgate – but Sigmar intends to seize this portal for himself. Arkas Warbeast, Lord-Celestant of the Celestial Vindicators, was once a mortal ruler of these lands. Now, with the aid of the Knights Excelsior, he has returned to free his kingdom from the clutches of Chaos and claim the realmgate in his God-King's name. But first he must vanquish the ghosts of his past and overcome his own conflicted nature, in order to unleash the beast within.