|"There are plenty of eye-witness accounts. Just because you're so narrow-minded you need to have everything shoved under your nose before you–"
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Horned slugs are a type of a slug that, when stewed, are used as an ingredient in the Boil-Cure Potion. They were kept with other potion ingredients in the Potions Classroom at Hogwarts School of Witchcraft and Wizardry.