Rank 1 Ahroun Gift / Rank 1 Get of Fenris Gift
By raking his claws over stone, steel, or another hard surface, the Ahroun hones them to razor sharpness. Either a cat- or bear-spirit teaches this Gift.
System: The player spends one Rage point, and the Ahroun takes a full turn sharpening her claws. All claw attacks do two additional dice of damage and are made at -1 difficulty for the rest of the scene.
Source: W20
The Source for this should also be Corebook Revised (found on page 142)
The system was different in Revised.