Thunder Rebuke

You point your finger, and the creature that damaged you has a burst of sound in their head. The creature must make a Con saving throw. It takes 2d8 fire damage on a failed save and be nocked prone, or half as much damage on a successful one.

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.