- "Erumpent horns, tails, and the Exploding Fluid are all used in potions, though classified Class B Tradeable Materials"
- — Erumpent horn's use in potions[src]
An Erumpent horn is a powerful magical object that comes from the Erumpent. The horn contains a deadly fluid that causes whatever it is injected into to explode. They are highly prized as potion ingredients, but are listed as a Class-B Tradeable Material.
Luna Lovegood's home was destroyed by an Erumpent horn that Xenophilius Lovegood claimed to be the horn of a Crumple-Horned Snorkack. He proudly displayed it despite the warnings given to him by Hermione Granger, and he accidently blew it up while trying to stop her, Harry Potter and Ron Weasley from escaping Death Eaters shortly after Christmas in 1997.