Azuredge

Azuredge is an enchanted throwing axe +3 which returns to the hand of the wielder, but it can be used in melee combat either. The weapon deals 1d6 points of damage and it has no bonus to thaco, but the weapon deals 1d6 +4 points of damage to the undead, who must make saving throw with a -4 penalty or be destroyed instantly. This enchantment is very similair as the enchantment the Mace of Disruption has. This item appears in Baldur's Gate II: Shadows of Amn. It's for sale at the Copper Coronet in the Athkatla Slums.

In-game description
"Azuredge Axe +3: Gulen Rockfire, Slayer of Undead, crafted this powerful throwing axe expressly for reinforcing his claim to his namesake. Blessed by a cross-section of gods, this weapon does phenomenal damage against creatures unwisely rebelling against their deceased status, and can potentially destroy them in a single blow. Obviously Gulen no longer carries Azuredge, and it is rumored that he died fighting a powerful vampire years ago, only to rise as one himself. This may have softened his stance regarding the undead, at the very least prompting a change of name."