Deathly Rebuke

Your finger becomes nothing more then skeletal bones as you point your finger, and the creature that damaged you is momentarily surrounded by ghastly teal flames. The creature must make a Constitution saving throw. It takes 1d10 fire damage plus 1d10 necrotic damage on a failed save, 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 1d10 necrotic or 1d10 fire damage of your choice for each slot level above 1st.