Stonefire

Stonefire is an enchanted battle axe +3 which inflicts 1d8 +3 slashing damage and +2 points of fire damage. It has THACO bonus of -3, a speed factor 4 and it weighs 7 lbs. >This item appears in Baldur's Gate II: Shadows of Amn and Baldur's Gate II: Enhanced Edition. It's not known where it can be acquired.

In-game description
"Stonefire, Battle Axe +3 The Stonefires were an old lineage of dwarves, and the eldest male of the line carried this axe, an heirloom of utmost importance. Unfortunately they were decimated in 1150DR, falling in a mere two years to a mysterious plague. Ulgan, keeper of the axe, fled in the hopes of escaping the inevitable, but he died several weeks later.  His body was found in the Cloakwood Forest, but the axe was missing."