various
Mortarch of Night
Realmgate Wars (series) part 9

Sent to the Realm of Death in search of Nagash himself, Lord-Celestant Tarsus and his Bull-Hearts find an unexpected – and untrustworthy ally – whose destiny will become entwined with their own.
Age of Sigmar
anthology

It contains:
The Beasts of Cartha
The Realmgate Wars: the Lords of Helstone
The Prisoner of the Black Sun
Great Red
Bridge of Seven Sorrows
Sands of Blood
Fist of Mork, Fist of Gork
Sands of Blood
Only the Faithful

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