Whelm

You temporarily engulf the mind of a creature within range in psychic energy, stifling its senses and wits. The target must make an Intelligence saving throw. On a failed save, the target takes 2d8 psychic damage, or half as much on a successful one. On a failed save, the target also has disadvantage on Intelligence and Wisdom ability checks until the end of your next turn.

If you reduce a creature to 0 hit points with this spell, you can choose to have the creature fall unconscious and stable rather than killing it.

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d8 for each slot level above 2nd.