Arrow of Slaying

Arrow of Slaying is an arrow which can be used to instantly slay Ogre Mages, but to other creatures it deals 1d6 points of damage. The arrow also has -15 THACo, to assure one hits the target and does not waste a lot of cash for this arrow, as it can be bought from Sorcerous Sundries for about 3000 gold coins. This item appears in Baldur's Gate and Baldur's Gate: Enhanced Edition.

In-game description
"This arrow is twisted and black, almost radiating evil as if possessed by something larger than itself. It was made specifically to kill one type of creature and one type only. In this case the unlucky being is the Ogre Mage."