Khelben "Blackstaff" Arunsun (414 DR – 1374 DR, aged 960 years, although rumors are he may still be alive being a Chosen of Mystra) was the Lord Mage of Waterdeep, a masked Lord of Waterdeep, and powerful archmage. He resided in Blackstaff Tower until his death. One of the few spellcasters to become one of Mystra's Chosen, and the last survivor of House Maerdrym, Khelben was a serious, imposing wizard, and a grim proponent of law and order whose methods of achieving the ultimate good were often highly questionable in the eyes of the righteous.