From user Burly Burger on D&D Beyond (Page does not exist anymore)

Disruptive slap

0-level (Cantrip) Evocation

Tiny hands materialize from nowhere try to slap the target repeatedly in a random fashion. The target must succeed a Dexterity saving throw or suffer 1d4 force damage. If the target is hit and is concentrating on a spell, it must succeed a saving throw against the caster spell save DC + 1 or lose concentration.
At higher levels: At level 5, damage becomes 2d4 and saving throw becomes DC + 2, at level 11, 3d4 and DC + 3, and at level 17, 4d4 and DC + 4.