D&D 5e Spell Evocation

Hellish Rebuke

The creature that damaged you is momentarily surrounded by green flames.

Level: Level 1
Casting Time: Reaction
Range: 60 feet
Target: Creature
Duration: Instantaneous
Saving Throw: Dexterity
Concentration: No
Components: V S

The creature that damaged you is momentarily surrounded by green flames. It makes a Dexterity saving throw, taking 2d10 Fire damage on a failed save or half as much damage on a successful one.

Using a Higher-Level Spell Slot. The damage increases by 1d10 for each spell slot level above 1.