Errtu

Errtu is a Balor lord who owns his own layer of the Abyss and the tanar'ri inhabitants who reside there. He once worked for a group of liches who created the artifact named Crenshinibon. When it was brought to 'life', Errtu was cast back to the Abyss. He had thought Crenshinibon was destroyed in the same blast. Ever since he heard that it hadn't actually been, Errtu has been devoting his existance to finding Crenshinibon again. This has led to altercations with Drizzt Do'Urden who has been trying to keep it out of Errtu's hands. When Wulfgar was 'killed' by a Yochlol, Lolth gifted Wulfgar to Errtu to use as a bargaining chip in exchange for his guadianship of Menzoberranzan during the Time of Troubles. His efforts eventually won out and the artifact was finally his. He struggled with dominating Crenshinibon's personality, as had all of its previous owners but was soon killed by a combined effort from the Companions of the Hall. Crenshinibon was destroyed by Jarlaxle not long afterwards and Errtu has not been heard from on the Prime Material Plane since.