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Redcaps are malevolent supernatural beings from Border folklore, known for their red hats which are said to be dyed with the blood of their victims. They are often depicted as small, grotesque creatures with sharp teeth and claws, who dwell in ruins and old castles. Redcaps are said to attack travelers who stray into their territory, and must be kept at bay with iron, as they are believed to be vulnerable to the metal. Legends of redcaps are most commonly found in the Scottish Borders region.