Lethifolds

A Lethifold is a fictional animal in the Harry Potter book series by J.K. Rowling. In appearance it is similar to a black cloak approximately half an inch thick, somewhat thicker if it has recently digested a victim. A Lethifold is carnivorous, gliding along the ground and possibly other surfaces in an unknown mode of locomotion in search of prey to suffocate and digest. The only reported prey is humans (including wizards), and the only known spell capable of repelling a Lethifold is the Patronus Charm. As it generally attacks sleeping victims, however, few manage to actually apply this knowledge. The Lethifold is a mercifully rare denizen of the tropics, and has yet to appear in the main novels.