Wicked Edge of the Planes

The Wicked Edge of the Plane is the ultimate one-hand specialty axe made by Master Axesmiths who are the only ones who can wield it. The original Black Planar Edge axe is consumed in the crafting. It gives a higher bonus to critical strike rating and attack power.

Source
This item is crafted with Blacksmithing (375); taught once by Weaponsmithing trainers, requiring the Axesmith specialty.