Synaptic Feedback

You project a field of disruptive psychic energy around you. Any creature that starts its turn within 10 feet of you must make an Intelligence saving throw. On a failed save, the creature takes 4d6 psychic damage and has disadvantage on all attack rolls and ability checks until the start of its next turn. On a successful save, the creature takes half damage and suffers no further effects.

At Higher Levels: When you cast this spell using a spell slot of 6th level or higher, the psychic damage increases by 1d6 for each slot level above 5th.