Huldra is a seductive forest spirit from Norse mythology. A tricky creature, this long-haired blonde nymph lives in luxury in the mountains of Norway. Huldra offers rewards to those who satisfy her sexually and death to those who fail to do so. When she chooses a man to seduce, he is never seen again.  

Huldra can only be recognized by her cow tail, which she hides under her skirt upon meeting humans - so beware when you see a beautiful young blonde wandering in the forest.