A bone dropped by a dead Yeti.
Sell Price to Secret Vendors: 100Gold
Sell Price at Black Trader: 2K-10KGold
How to Obtain:
Dropped by Guardian Yeti and Yeti Highguard.
Ingredient for crafting:
at NPC Mystal in Lighthouse Dungeon 2F.
It is also worth holding to make equipment to make a high amount of gold currency.