Thunder Fist

You imbue your fists with thunderous energy. For the duration, your unarmed attacks deal 2d4 thunder damage. On a hit, you can choose to force the target to make a Dexterity saving throw, pushing the target 5 feet on a failure. The spell ends early if the target is successfully pushed.

At Higher Levels. This spell's damage increases by 2d4 when you reach 5th level (4d4), 11th level (6d4) and 17th level (8d4).