Torrential rebuke

You point your finger, and the creature that damaged you is momentarily battered by frigid ocean waves. The creature must make a Dexterity saving throw. It takes 2d10 cold damage on a failed save and is knocked prone , or half as much damage on a successful one with no additional effects 

At Higher Levels. When you cast this spell using a spell slot of 2nd level or higher, the damage increases by 1d10 for each slot level above 1st.