William King
Giantslayer
Gotrek & Felix (series) part 7

Gotrek & Felix's adventures take an unexpected twist as they are recruited by the elven archmage Teclis to help him save the world by thwarting the machinations of Chaos on the secretive isle of Albion.
Warhammer
novel

Also in:
Gotrek & Felix: the Complete Journey
Gotrek & Felix: the Third Omnibus