Fireball

Casting Time: Action
Range: 150 feet
Duration: Instantaneous

A point you choose within range erupts in a 20-foot-radius Sphere. Each creature in the area makes a Dexterity saving throw, taking 8d6 Fire damage on a failed save, or half as much damage on a successful one. Flammable objects not being worn or carried ignite.
Using a Higher-Level Spell Slot. The damage increases by 1d6 for each spell slot level above 3rd.