Wolfbane the Shepherd
Wolfbane the Shepherd is a unique quarterstaff that is received as a reward for completing the side quest "The Other Side of the Seas". There is also a small chance to receive it as a reward for searching Unspoiled Ruins.
The name of this staff explains its origins. It appears to be covered with tiny nicks, and legend says that one of those marks was cut for every dire wolf head taken by the weapon.