Horned slugs are an ingredient the boil-cure potion. The slugs must be stewed before being added to the potion (PS8).
There is no actual species of slugs called a "horned slug," but many types of slugs do have two tentacles which extend from their head. These are not horn -- in fact, they are used to detect light -- but do give these slugs a horned appearance.
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Tags: animals boils ingredients