Zorok met his demise at the hands of The Watch during The Battle of Storms. The party later pieced together that he had been tapping into surplus power provided by the Element Stones, as well as those provided by Magical Items. Something about his demon heritage allowed such practices that took the form of Rune Grafting, an unpleasant practice in which magical glyphs are carved into the body to host the stolen magic.
The origins of Zoroks Demon parentage is unknown to this day, but it was undeniably paramount in his success as a warleader and uniting the Goblinoids of West Guradam.