Tales of the Red Way
A sinister lich, master of magic and alchemy.
Varth was an insane alchemist who lived in the Undercity beneath Dragonspire. His mad experiments revolved around the preservation of life beyond their normal range as well as strange hybrid experiments. After trying to trap Balthazar, Sir Eckart, Vecca Vex, Hoo and Thoven, the group managed to defeat him.
Vecca, being somewhat sentimental, kept his skull and ulna and spell components and magic foci.
Being that Varth is undead and was a lich, his defeat is hardly a foregone conclusion as evil undead entities often find a way of returning to haunt the living.