Fireball

A bright flame blossoms with a low roar into an
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. Each extra spell slot increases
the damage by 1d6.