Dybbuk

Dybbuks are an incorporeal race of jellyfish-like fiends that inhabit the Abyss

Appearance
In their natural form they appear as translucent flying jellyfish with long trailing tentacles.

Abilities

 * Magic Resistance - The dybbuk has advantage on saving throws from spells and other magical effects.
 * Possess Corpse (Recharge 6) - The Dybbuk disappears into an intact corpse of a large or smaller creature within 5 feet. The dybbuk assumes the creature's stat block with the creature type becoming undead until the corpses hitpoints are reduced to 0 or the dybbuk chooses to leave the corpse using a bonus action, at which point it reappears within 5ft of the Corpse.
 * Violate Corpse - Whilst possessing a corpse the Dybbuk can use a bonus action to make it do something unnatural and/or horrifying. Any beast or humanoid who sees this behavior must pass DC 12 wisdom save or become frightened of the Dybbuk for 1 minute, and a successful save makes the target immune to the effect for 24 hours.
 * Innate Spellcasting (Charisma-based):
 * Dimension door - at will
 * Fear - 3/day
 * Phantasmal force - 3/day
 * Senses:
 * Darkvision 120ft
 * Passive Perception 14
 * Attacks:
 * Tendril