Erumpent tail

"Erumpent horns, tails, and the Exploding Fluid are all used in potions, though classified Class B Tradeable Materials."

- Erumpent tail's use in potions

Erumpent tails are long and rope-like. They are originally the tail of an Erumpent. They are classified as a Class B Tradeable Material. The use of Erumpent tail in potions remains unknown though it has been mentioned to be an potion ingredient.

Appearances

 * Fantastic Beasts and Where to Find Them