From The Heroes of Might and Magic III wiki

Equipped in a misc. slot, this artifact increases your Archery skill by 15%. You must have the Archery skill for it to have any effect.

Class: Major

Basic Cost: 30000 gold

Part of the Bow of the Sharpshooter, together with the Bow of Elven Cherrywood and the Bowstring of the Unicorn's Mane.