Valygar's Body

Valygar's Body will be obtained if you decide to kill Valygar Corthala in the quest The hunt for Valygar Corthala. It can used to open the door of the Lavok's Sphere. You can, however, enter it also by bringing him with you alive as a party member.

Baldur's Gate II: Shadows of Amn

 * Valygar's Cabin, Umar Hills

In-game description
"This is the body of Valygar."