Description
There is no love lost between the Knights of Poitain and the Zingarans who live just to their south across the border. The Zingarans raid the rich lands of Poitain and the knights take revenge by crossing the border and burning ever crop and field that they see.
The Bec-de-Corbin was developed by a wily Zingaran fighter who wished to be able to more easily penetrate the armor of his Poitanian foes. Copies of the weapon quickly spread southward, along with word of its effectiveness.
Using this weapon in battle provides the wielder with greater armor penetration.
Source
The Bec-de-Corbin can be found in 
Legendary Chests.
Repair
This item can be repaired with a Legendary Weapon Repair Kit.