Casting Time: 1 action
Range: 150 ft
Components: V, S
Duration: Instantaneous
Damage Type: Fire
Save: Dexterity
A storm made up of sheets of roaring flame appears in a location you choose within range. The area of the storm consists of up to ten 10-foot cubes, which you can arrange as you wish. Each cube must have at least one face adjacent to the face of another cube. Each creature in the area must make a Dexterity saving throw. It takes 7d10 fire damage on a failed save, or half as much damage on a successful one.
The fire damages objects in the area and ignites flammable objects that aren't being worn or carried. If you choose, plant life in the area is unaffected by this spell.
Verbal Component:
Tempesta Incendo
Verbal Component (Alternative):
Primordial flame, a rage most dire, twisting, searing, a storm of fire.
Classes: Cleric, Druid, Sorcerer
Domain: Fire
Tags: Damage
Source: Player's Handbook [5th Edition] (page 242)
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Other Planes and Effects
Below is information about this spell as it relates to other planes and area of effects (i.e. underwater). Some of the information is pulled official D&D sources (such as books and the twitter feeds of D&D officials), but other information is derived from forums and online discussions. As always, it is up to the DM to decide how they wish to handle spell effects.
Underwater - Verbal Component
Official rules have been verified by Jeremy Crawford - "No rule prohibits verbal components from working underwater. Keep in mind that if you're talking, you're not holding your breath." Hence, while submerged underwater and holding its breath, a creature can cast a spell that requires a verbal component. After casting the spell, if the creature can't breathe underwater, it immediately runs out of breath. The creature can survive for a number of rounds equal to its Constitution modifier (minimum of 1 round).
Underwater - Fire Effects
The PHB p198 clearly states "Creatures and objects that are fully immersed in water have resistance to fire damage." Other than that, there are no official rules regarding fire spells underwater. But, as always, it is always up to the DM to decide if fire spells should have different effects (i.e. half range, half area of effects, half duration, etc.). In addition, Jeremy Crawford has clearly stated, regarding a fireball vaporizing water, "Nothing in the rules causes a fireball to vaporize water. Magic ≠ physics. DMs may apply whatever magical/scientific logic they like."
