Josh Reynolds
Skaven Pestilens

The Crawling City is under siege. The diseased hordes of the skaven Clans Pestilens seek the way to one of the Thirteen Great Plagues and this colossal worm holds the key – but to claim it, they must defeat the might of Sigmar's Stormcast Eternals...
Age of Sigmar
novel

Also in:
Legends of the Age of Sigmar: Omnibus 1