Okay, so recently there was this A-Z blog challenge. I missed it but decided to start one of my own this month. The idea is to profile 26 supernatural beings (hopefully) beyond the ubiquitous werewolf or vampire.
The first creature is the Alp. I came across this spirit from ancient German folklore in Finlay Cowan's Fantasy Artist's Pocket Reference: Incredible Characters.
I highly recommend this book, along with Dragons and Fantasy Beasts, especially if you're into drawing or writing about mythological creatures.
Anyway, here's a link to the alp, via Wikipedia.