Dissonant Image

You choose a point within range to create a disturbing image that appears different to all creatures viewing it. The air in a 20-foot sphere around this image grows cold and still.

Any creature that starts its turn, or enters the area on its turn must make a Wisdom saving throw. On a failed save the creature becomes frightened of the image. While frightened, the creature takes 3d6 psychic damage at the start of each of its turns. At the end of its turn, the frightened creature can remake the Wisdom saving throw. On a success, the frightened condition ends and it becomes immune to the spell's effects.

As a bonus action, the caster can move the image up to 20 feet in any direction.

The images lasts until dispelled or until it takes radiant damage.

Creatures frightened of the image remain so until they succeed on a Wisdom saving throw. 

At Higher Levels. When you cast this spell at 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.