To get the entire Raging Wolf Set, you must defeat Vargram the Raging Wolf. You can do this via a questline. It's important to complete this questline before defeating Rykard, Lord of Blasphemy or ...
Grants an armament the Keen affinity and the following skill: "Raging Beast: Step with the swiftness of a beast, leap high, and slash foe from above. Initial step can be taken forward, backward, left, ...