This creature of the underworld looks like a man or woman, seen from behind. But if one walks around to where the face should be, it seems to turn so that it is still facing away from the viewer. This effect continues even if it is observed from multiple angles.
If the creature is reflected in a mirror, the reflection will be of a person with their back to the mirror. There are said to be other ways to see the creature's face. Doing so is said to give the viewer great knowledge, but many caution that it should not be done.