Bound Shadow (5e Creature)
From D&D Wiki
Medium aberration, neutral evil
Damage Vulnerabilities Psychic and Radiant
Shadow Body Due to the nature of their form, Bound Shadows are incredibly difficult to see even when their presence is known. In order to see a Bound Shadow a creature must both have dark-vision and know of the shadows presence.
Shadow Step Due to the fact that Bound Shadows are both transparent and intangible, they are able to teleport to any shadow anywhere in the world instantaneously.