WotC Code:

Unknown

The following text is taken from the WotC website:

'The seat of arcane power, where the Arch Mage of Waterdeep holds his court. A dark monolith where the rules of reality do not apply. All Waterdeep rests in the shade of Blackstaff Tower

In Blackstaff, a man who helmed the Forgotten Realms for years tackled an epic tale of the famous wizard Khelben "Blackstaff" Arunsun -- and wrote an instant classic. In Blackstaff Tower, Steven Schend delves once more into the lore and wizardry of the Realms, and spins a tale that is a "must" for all who hold Waterdeep dear, and want to know what goes on behind the masks many folk in the Forgotten Realms wear. Pay much attention to the man behind the curtain!
-- Ed Greenwood'

See also - Blackstaff (The Wizards, book 1)