I met a zombie-killing dwarf named Edgrim Bofstrem who seems to have taken it upon himself to get rid of all the undead found within the Cavern of the Afflicted. He did take a moment to tell me about a particularly nasty foe, called Bonegrinder by the locals in the area. I've agreed to track down this fiend and slay him lest he come to the surface and attack the innocent.