The renown Warlock known as Carnamagos had not exactly been evil, but he had certainly been morally questionable. The well known tales about him, while impressive, had been grim. He had not come to a good end. But he had been nothing if not powerful.
Two of his artifacts, the Testaments of Carnamagos and the Blade of Carnamagos survived him, and still occasionally surface in the The Thousand Isles.