Thunder Punch

You charge your hand (or similar appendage) with thunderous power. Make a melee spell attack against a creature within 5 feet. On a hit, the target takes 3d8 thunder damage and is knocked 10 feet back. A mighty boom rings out, which is audible from up to 300 feet away.

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 1st.