As you spend 1 minute to cast this spell, you shape the dreams of a creature known to you. You, or a willing creature you touch, enters a trance state, acting as a messenger.
While in the trance, the messenger is aware of its surroundings, but is immobilized and incapacitated. The creature must make a Fortitude saving throw, which it does with disadvantage if if you have a body part, lock of hair, clipping from a nail, or similar portion of the creature’s body. If the creature isn’t on the same plane of existence as you, isn’t asleep, or doesn’t sleep, the spell has no effect on it.
On a failure, it takes 3d6 psychic damage and is echoes of the phantasmal monstrosity spawn a nightmare that lasts the duration of the target’s sleep and prevents the target from gaining any benefit from that rest.
On a critical failure, it takes twice as much damage.
On a success, it takes half as much damage.
On a critical success, it takes no damage.