Fire Storm

7th-Level Evocation Spell (Cleric, Druid, Sorcerer)

Casting Time: Action
Range: 150 feet
Components: V, S
Duration: Instantaneous

A storm of fire appears within range. The area of the storm consists of up to ten 10-foot Cubes, which you arrange as you like. Each

A Cube is an area of effect that extends in straight lines from a point of origin located anywhere on a face of the Cube. The effect that creates a Cube specifies its size, which is the length of each side.

A Cube's point of origin isn't included in the area of effect unless its creator decides otherwise.

must be contiguous with at least one other

A Cube is an area of effect that extends in straight lines from a point of origin located anywhere on a face of the Cube. The effect that creates a Cube specifies its size, which is the length of each side.

A Cube's point of origin isn't included in the area of effect unless its creator decides otherwise.

. Each creature in the area makes a Dexterity saving throw, taking 7d10 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.

.

Source: Player's Handbook, p. 275