Huldra appears in old Scandinavian folklore as a seductive forest creature, the Lady and ruler of the forest. The huldra is stunningly beatiful, but if you saw her from behind you could see she is hollow with a hole in her back, just like an old tree. She also has an animal’s tail, in Norway it’s a cow’s tail, but in Sweden(where I live) it is usually a fox’s tail.Huldra is very interested in humans, especially men, and rewards those that are kind to her, but she can make your life miserable if you make her angry.
In some traditions, she lures men into the forest to make romance(sex), rewarding those that gives her satisfaction and often killing those who don’t or refuse her.
Sometimes she marries a local farm boy.When they are married in church, the tail falls off. If the man doesn’t treat her right, she will be incredibly ugly and the husband will suffer greatly throughout the marriage.