From Knave To Master's Apprentice: Tales From The Renge: The Prophecy, Book8

The Black Ring has risen. The necromancers and vivisectionists are back. The high king of all demons has taken over Valthrid, the city of the Inquisition. As Master Jenarra watches his power slip away, he realizes there is no hope. Golmagug has ceased to be human. There was never any power to be had over the demons. It was all a lie. But it is too late. Events are now unfolding that will change the Renge forever.