Now joined on his quest by Great Sword Vogel, Witch Hunter Magnus Gault traces the source of the Chaos contamination to a battlefield that saw one of the Empire's greatest defeats. Venturing inside the labyrinthine Skaven-infested caverns, Gault and Vogel join forces with Vargni the dwarf (from Warhammer: Forge of War) and together they uncover the origin of the corruption that has been plaguing the land.