Brulach was a balgura demon from a hellish plane of Grudesh that found its way into the body of Unknown, possessing it for a while and using its position to spread uncertainty and discord throughout the Huddle of Bucktuck City. Brulach was removed from the Ivan's body by the Cursebusters, who subsequently chased him down and killed him when he attempted to escape.
Brulach's body was apparently recovered by the Dark Embers.