Fossegrim are Norweigian faeries whose bodies differ from humans in two ways: One, they are very tiny, and two, they have no feet. They usually live around or behind waterfalls and attract marks to play their pranks on by singing very lovely tunes. They are said to play their pranks all in good fun, but go too far with them, not knowing that they are causing great harm. The morals of faeries tend to not match those of mortals.