SAREVIMM.ITM

SAREVIMM.ITM an undroppable NPC-only item, usually a belt in Baldur's Gate II: Enhanced Edition and Baldur's Gate II: Throne of Bhaal.
It is assigned to a few high-level creatures in the game to provide immunity to the Deathbringer Assault innate ability typically delivered in melee by Sarevok Anchev in the Throne of Bhaal content part of the game, but also worn by a creature that is part of Watcher's Keep, which is accessible to the player with BG2EE.