In the book "The Shadowing; Hunted" by Adam Slater (who has a degree in folklore), the Fetch is described as a tall, thin, skinless being with unblinking eyes. Once it has seen a human's face, it can then change it's appearance to imitated that person. It feeds primarily off the eyes of it's victims and can only be weakened by forcing it to look upon it's reflection while in it's true form. Like all undead/netherworld creatures, it must be invited into buildings, such as houses, if it is to enter.
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