The Redcap is what happens when a good fairy goes bad. It is a type of malevolent, murderous, leprechaun-type of being mostly found in Scotland, but occasionally can be found roaming ruined castles in the north-east of Ireland. He is said to inhabit ruined castles and, especially, those that were the scenes of brutal and wicked deeds, and the Redcap is known for soaking his cap in the blood of his victims.
He is usually depicted as “a short, thickset old man with long prominent teeth, skinny fingers armed with talons like eagles, large eyes of a fiery red colour, grisly hair streaming down his shoulders, iron boots, a pikestaff in his left hand, and a red cap on his head” When unwary travellers take refuge in his lair, he flings huge stones at them, and if he kills them, he soaks his cap in their blood, giving it a crimson hue. It is said that he is unaffected by human strength but can be driven off by using words of Scripture or by brandishing a Crucifix, which will cause him to utter a dismal yell and vanish in flames, leaving behind a large tooth.
According to some 19th-century folklorists, the redcap has other varieties of his kind, some of which inhabit old forts, castles and some old church towers. It is said that the main activity of this other type of Redcap is to make noise like the beating of flax, or the grinding of barley in a hollow stone quern. But, if this sound goes on longer or louder than usual, it is considered to be an omen of death or misfortune. It is said that many of these forts and castles were built by the early occupants of the land, who allegedly bathed the foundation stones in human blood and caused such hauntings to occur. Those who study the spirit world suggest that the Redcaps might indeed be ‘Elementals’, because they are made up of the ‘ethers’ and are ‘ethereal’ and therefore invisible to (most) of us, attaching themselves to practically every natural thing.