Feral Tail

Feral Tail is a quest item that can be obtained by defeating Snow Wolves in Deep Snow Caves. It has no use outside of the quest-related progression it belongs to, so it is primarily something to collect and turn in rather than a material for crafting or combat.

Because it drops from Snow Wolves, the most direct way to get it is to explore Deep Snow Caves and fight those enemies until the item appears. Since it is tied to a specific enemy and biome, it is not something that can be gathered from general exploration or from most other sources.