Griskin
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The Griskins are a ghostly tribe of Teensies who haunt the Land of the Livid Dead, a location seen in Rayman 3. The Griskins have also been known as Mad Spirits, as well as the Livid Dead.
The following text comes from the official Rayman 3 website:
The mystic Griskins weren't always ghosts. Once, their tribe roamed the Moor and performed their incantations freely. But the Great Spirit Palmito was aggravated by all the racket, so he turned the Griskins into ghosts and confined them to a great tower where their singing wouldn't wake up any more spirits.
At least some Griskins have the ability to generate and manipulate lightning; when Rayman releases a group of Griskins from Palmito's tower in the third part of the level, they reward him by electrocuting two Hoodbooms and a Hoodmonger that were about to attack him.