Mace of Disruption

Mace of Disruption is an echanted weapon +1. It has a -1 THACo, deals 1d6 +2 points of damage against any other enemy who is not an undead, but against undead, it deals double the damage, 2d6 +4 points and if they fail their save, with a -4 penalty against undead, they are destroyed. This item appears in Baldur's Gate II: Shadows of Amn and Baldur's Gate II: Enhanced Edition. In chapter 3, this weapon can be found in the pool of blood, close to the coffins of three vampires in Bodhi's Lair underneath the Athkatla Graveyard.

In-game description
"Mace of Disruption +1 This heavy mace was created for a very specific purpose: to slay undead. Any such creature hit by it not only feels the sting of weapon, but also has a chance of being simply blasted from existence. There are legends that speak of a priest so holy a single glancing touch could send a vampire to oblivion, but whether the weapon empowered her or she empowered it is a topic for theologians."