The Story of the Korrigans

They are British goblins. They are said to be black, hairy, and to have an enormous head. They live in caves, where they spend their whole lives from birth until death.
These beings have magical powers. When they receive gifts, they cause humans little trouble, but if they don't get what they want, they can move objects around the house, open the animal pens and make the fruit fall from the trees.
The word Korrigans (from Breton korr, dwarf, followed by the diminutive ig and the suffix an, Breton plural: Korriganed) means "little dwarf".
Sometimes also called poulpiquets, they are spirits that take the appearance of dwarves, or of old women or beautiful maidens, endowed with magnificent hair and glowing red eyes, with which they can bewitch mortals.
Guardians of treasures hidden in hills and forests.
The females haunt springs and fountains, with the power to lure men with their singing and then kill them.
They are also said to be guardians of hidden treasures concealed in hills or forests, associated with fairies or magical beings that share similar characteristics or symbolism.
They also make changelings (swapping their own children for human ones). On the night of Samhain, they could be seen near dolmens, waiting for any unwary person who came near, to take them to their world as revenge for the losses humans had caused them.
They were also helpers of witches in the Middle Ages, and they gathered in meadows or in the undergrowth. It is said that there they form a circle to dance when night falls.
For mortals who bother them, they sometimes set challenges that could turn into deadly traps leading straight to hell.
Some people claimed that on the night of October 31, the korrigans gather, wild and restless, near stone tables or monoliths, ready to drag their victims into the underworld to avenge the dead for the misdeeds of the living.