Grue
A year ago last Thursday I was looking for some gold, when I met a dwarf who thought he knew the best, for the map I'd made said northwards was the way back to the house, but he followed me insisting it was west. So I turned off to the west, but straight away it all went dark, and I stood a moment thinking what to do, when all at once a hollow booming voice beside my ear said in a sort of whisper: "I'm a grue."