1st-level Evocation

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 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 2d10 for each spell slot level above 1.