You attempt to mentally ensare a creature that you can see within range. It must succeed on a Wisdom saving throw or take 3d8 psychic and becomes charmed by you for the duration. On a successful save they take half damage and aren't charmed. 

If the spell takes effect you gain a brief insight into the targets thoughts and memories. You are able to also see and control the nightmare state they are placed under, they do perceive this as reality until the spell effects end. While in this state they see enemies as friends and friends as enemies and act accordingly. 

Each time the target takes damage after the original psychic damage, it makes a new Wisdom saving throw against the spell. If the saving throw succeeds, the spell ends.

At Higher Levels. When you cast this spell using a 5th-level spell slot, the duration is concentration, up to 5 minutes. When you use a 6th level spell slot, the duration is concentration, up to 10 minutes. When you use a 7th-level spell slot, the duration is concentration, up to 1 hour. When you use a spell slot of 8th level or higher, the duration is concentration, up to 8 hours. In addition when you cast this spell using a 6th level spell slot of higher add 1d8 psychic damage per spell level.