Rod of Smiting

Rod of Smiting is an enchanted quarterstaff +3 which can only be wielded by clerics and wizards. The rod is designed for fighting golems, it inflicts 10 more points of damage and they must make a saving throw vs. death every time they are hit or they get destroyed.

To all other targets, it deals 1d8 +3 points of damage and it has -3 THAC0 bonus. The weapon weighs 3 lbs and has a speed factor of 1. This item appears in Baldur's Gate II: Shadows of Amn and Baldur's Gate II: Enhanced Edition. It's not known where the Rod of Smiting item can be acquired.

In-game description
"Rod of Smiting This long, thin rod can be wielded as a staff. This rod has been designed to destroy golems. Any golem struck by the rod must make a saving throw or be destroyed. In the hands of any other than a cleric or mage the rod becomes unusable."