Fireball

3rd-Level Evocation Spell (Sorcerer, Wizard)

Casting Time: Action
Range: 150 feet
Components: V, S, M (a ball of bat guano and sulfur)
Duration: Instantaneous

A bright streak flashes from you to a point you choose within range and then blossoms with a low roar into a fiery explosion. Each creature in a 20-foot-radius

A Sphere is an area of effect that extends in straight lines from a point of origin outward in all directions. The effect that creates a Sphere specifies the distance it extends as the radius of the Sphere.

A Sphere's point of origin is included in the Sphere's area of effect.

centered on that point makes a Dexterity saving throw, taking 8d6 Fire damage on a failed save or half as much damage on a successful one.

Flammable objects in the area that aren't being worn or carried start

A burning creature or object takes 1d4 Fire damage at the start of each of its turns. As an action, you can extinguish fire on yourself by giving yourself the Prone condition and rolling on the ground. The fire also goes out if it is doused, submerged, or suffocated.

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At Higher Levels: The damage increases by 1d6 for each spell slot level above 3.

Source: Player's Handbook, p. 274