Hellish Rebuke

D&D 2024 spell: Hellish Rebuke. Source: Player's Handbook (2024). level 1, school Evocation, casting time 1 reaction, which you take in response to taking da...

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.

At Higher Levels

Using a Higher-Level Spell Slot The damage increases by 2d10 for each spell slot level above 1.

Source: Player's Handbook (2024), p. 284 - Licenses and attribution