Casting Time: 1 action
Range: 120 ft
Components: V, S, M
Duration: Instantaneous
Damage Type: Fire
Save: Constitution
Conditions: Exhaustion
User Created: This is an unofficial, user-created spell.
Check with your DM about using this spell.
You cause creatures within a 40-foot cube to experience an intense heat wave. Affected creatures must make a Constitution saving throw, and on a failure take 1d12 fire damage and take one level of exhaustion. This damage comes from heat and will not set anything on fire.
Creatures who are resistant or immune to fire do not suffer exhaustion.
Material Component:
a tiny hand fan
Verbal Component:
Calidi Fluctus
Classes: Bard, Druid, Ranger, Warlock
Domain: Fire
Tags: Damage
View Heat Wave Spell Card
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Spell FAQs
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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."
