Dream Eater

You touch an unconscious or sleeping creature and force them make a Charisma saving throw. If the creature is at 0 hitpoints, they have disadvantage on this saving throw. On a failed save, a creature that still has hitpoints takes 5d10 psychic damage and cannot benefit from the effects of a long rest for 24 hours. This damage does not cause the creature to wake up. If a creature that is at 0 hitpoints fails their saving throw, they immediately fail all three death saving throws and die. On a successful save a creature with hitpoints remaining takes half damage, and a creature with 0 hitpoints only fails 1 death saving throw, and both may benefit from a long rest.