Fire Blast

6th-level Evocation
Casting Time: 1 bonus action
Range: 30 feet
Components: S
Duration: Instantaneous

You conjure a quick, violent blast of fire at an enemy. The target must make a Dexterity saving throw. On a failure, the target takes 10d8 fire damage, or half as much damage on a successful one.
At Higher Levels. When you cast this spell using a spell slot of 7th level or higher, the damage increases by 1d8 for each slot level above 6th.

Source: Homebrew