Castle of Aandoran the Defiler

From publisher blurb: This is the third installment in the Mountain of Fire series. In this installment the adventurers must face an ancient vampire allied with the arch-lich Malcon. This ancient vampire sits in his lonely castle in the Dark Woods of Zanzia playing his pipe organ and creating an army of undead to do his bidding. This unholy artifact must be destroyed or all is lost!