A ghostly wizard appears.
Chorus is the ghostly conglomeration of the souls of the necromancers who were killed at the school of Ur-Nahash. He was formed when Erevis collected the bodies of the fallen and interred them in the new graveyard of Willowdale.
Chorus believes himself to be a teacher of Ur-Nahash, and does indeed posses a measure of arcane power. Taking lead from Erevis, he wished to return to helping instruct students in the ways of necromancy, and indeed now teaches at the school Nahasian Insights. Chorus is unable to leave Willowdale, but would likely choose not to at any rate, as he still believes it to be Ur-Nahash, though he does readily complain about the number of buildings that seem to have sprung up on school grounds, not to mention the rascal who keeps stealing the lawnmower.