Fossegrimen is a nordic spirit who lives in waterfalls and is neither good nor evil. The Fossegrim is a magnificent musician who plays the fiddle day and night.
If an aspiring fiddle player ventures to seek his help, the Fossegrim will gladly help, for a price of course. He must go to the waterfall and offer him a nice meal, usually a good plump joint of meat.
Many stories tell of travelers who have tried to palm the Fossegrim off with an inadequate piece of meat, resulting in the him just teaching the student how to tune his fiddle rather than play it.
He is said to be young and handsome though never leaves his waterfall.