Promethium battleaxe

The Promethium battleaxe is a weapon used while Dungeoneering in Daemonheim. It is made of the tier 10 metal Promethium and requires an Attack level of at least 90 to wield. It is the strongest one-handed promethium weapon and the second strongest battleaxe, behind the Primal Battleaxe. The promethium battleaxe can be made at level 95 smithing from 2 promethium bars in inventory via anvil, requiring 95 Smithing and giving 187 experience. It can be also obtained as a drop from a Forgotten warrior visibly wielding it, or as a boss drop from Yk'Lagor the Thunderous.

Dropping monsters
Promethium battleaxe