Tolgerias

Tolgerias was a Cowled Wizard who wanted Valygar Corthala dead so he could gain entry to Lavok's Sphere.

Baldur's Gate II
In Shadows of Amn Tolgerias will be in the Council of Six building in the Athkatla Government. He will ask you to kill Valygar Corthala and bring his body to him. Should you decide to enter the Planar Sphere yourself, Tolgerias will secretly follow you and you will have to fight him inside.