Gav Thorpe
Warbeast
Realmgate Wars (series) part 6

Lord-Celestant Arkas Warbeast of the Celestial Vindicators returns to the lands that he ruled in his mortal life – lands befouled by the verminous hordes of the Clans Pestilens. Can Arkas retain his focus and restore order to his lands?
Age of Sigmar
novel

Also in:
The Realmgate Wars: Volume 2
The Realmgate Wars: the Novels