Basic Rules , pg. 250
Hellish Rebuke
1-level
Evocation
Casting Time 1 Reaction
Range 60 ft
Duration Instantaneous
Components V, S
Damage Type: Fire
Saving Throws: Dexterity
Description: You point your finger, and the creature that damaged you is momentarily surrounded by hellish flames. The creature must make a Dexterity saving throw. It takes 2d10 fire 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 for each slot level above 1st.
Class(es): Warlock, Sorcerer