Warhammer - Gilead's Curse by Dan Abnett and Nik Vincent

Gilead Lothain returns! From the warrens of the skaven to the streets of Nuln, the shadowfast warrior and his faithful retainer Fithvael find themselves surrounded by evil. Beneath the earth, the dangerous and insane Rat King, its powers amplified by evil magic, plots Gilead’s downfall, while a bloodthirsty vampire count becomes an unlikely ally… and Gilead’s deadliest foe.