Casting Time: 1 reaction, which you take in response to taking damage from a creature that you can see within 60 feet of yourself
Range: 60 feet
Components: V, S
Duration: Instantaneous
The creature that damaged you is momentarily surrounded by green flames. It makes a Dexterity saving throw, taking 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 for each spell slot level above 1.