Shradin Mulophor

Shradin, a powerful Netherese necromancer who'd survived the collapse of his civilization. In 1148 DR, he learned of Sargauth Enclave and petitioned to become an apprentice to the Mad Mage. Halaster agreed and also allowed him to take the Enclave as his own. Shradin, calling himself the "Lord of Bones", turned the Enclave into Skullport, a neutral way-station in the Underdark, permanently linking Undermountain to the Underdark.