This item is a selectable reward for the quest  Vol. 3, Book 1 -- Chapter 6: Farewell to Evendim.
- Brungos (Legendary Vendor at Echad Dagoras in Enedwaith)
- Garanhir (Legendary Vendor at Lhanuch in Enedwaith)
- Badhordam (Legendary Vendor at Harndirion in Enedwaith)
|Item to Receive||Items to Trade|
|5 Silver Tokens of the Wilds||2 Golden Tokens of the Wilds|
This item is also contained in the which can be bartered from a Master of Battle Lore (Pelennor Rewards Vendor).
When applied to your legendary item, you'll get the following bonus: +... damage to Beast enemies (amount scales based on the base DPS of the item, up to a maximum of 27 for a level 100 1st Age Two-handed Weapon) and sets damage type to Westernesse.