In the bleak mountains of the Warhammer Old World, the dwarf race fights a bitter battle for survival against its ancient enemies. When Karak Varn is overrun by skaven ratmen, Dwarf Thane Uthor makes a rash vow to reconquer it, paying little thought to the enormity of such a task. How can his band of dwarfs, brave and stalwart as they are, ever hope to triumph against such impossible odds?