Tahazzar

Tahazzar was a tanar'ri demon from the Abyss, who became trapped in Watcher's Keep during the mid–14 century DR.

Abilities
Tahazzar possessed some inherent resistances and immunities that were typically found among fiends, including a form of natural regeneration.

Possessions
He had managed to located one of the scepter gems of the scepter of radiance, the item that granted passageway to the fourth level of Watcher's Keep.

Activities
Tahazzar led a band of demons that were engaged in the battles of the Blood War. He sought the heart of the baatezu Ka'rashur, who led a group of devils the demons sought to slay.

History
At some point, Tahazzar and his demons along with Ka'rashur and his devils became trapped within Watcher's Keep on Faerûn. The two groups of fiends continued their feud within the Maze Level of the keep.

Appearances

 * Video Games:
 * Baldur's Gate II: Throne of Bhaal