Wraith

Wraiths are a ghostly mythological creature originating in Scottish culture.

General Description
Wraiths are ill-defined in nature, but all have a similar appearance: a tall, usually silent spectre shrouded in a black hooded cloak, with his face either unseen, skull-like, or reduced to two glowing eyes. Wraiths can be anything from a demon to a ghost, and some wraith-type creatures in fiction can be entirely different things, such as aliens.

Inspired
Creatures in fiction or legends that were inspired by wraiths include:
 * Ringwraiths
 * Sluagh
 * Dementors (Harry Potter)
 * Dementors (Dementors)
 * Dementors (Harry Potter and the Methods of Rationality)
 * Wraiths (The Apprentice Librarian)
 * Wraiths (The Battle for Wesnoth)