A large grey African beast, the Erumpent weighed up to a tonne and might have been mistaken for a rhinoceros, at a distance. A thick hide gave it the ability to repel charms and curses, whilst its large sharp horn made it a dangerous creature, and any attack usually proved fatal for the witch or wizard involved. This was due largely to the deadly fluid contained within the Erumpent horn, which cause whatever object it was injected into to explode.