Fireball

A bright flame blossoms with a low roar into an
explosion of flame. Each creature in a 20 ft
radius sphere makes a Dex save. A target takes
8d6 fire damage on a failure, or half as much on
a success. The fire spreads around corners and
ignites flammable objects.
At Higher Levels. When you cast this spell using
a spell slot of 4th level or higher, the damage
increases by 1d6 for each slot level above 3rd.