Contact Other Plane

Casting Time: 1 minute
Range: Self
Duration: 1 minute
You mentally contact a mysterious entity from
another plane. When you cast this spell, make a
DC 15 Intelligence saving throw. On a failure,
you take 6d6 psychic damage and are insane until
you finish a long rest.
On a successful save, you can ask the entity up to
five questions.
See PHB, pg. 226.