You cause the area of a 30-foot cube within range to instantly increase in temperature. This temperature increase lasts for the duration. When the area appears, each creature in it must make a Constitution saving throw. A creature takes 3d6 fire damage on a failed save, or half as much damage on a successful one. A creature must also make this saving throw when it enters the spell's area for the first time on a turn or ends its turn there. This spell has additional effects when overlapping with areas of water. Being underwater does not confer resistance against the fire damage dealt by this spell. Also, any underwater areas within the spell’s area start bubbling furiously, turning those areas into difficult terrain and causing them to be heavily obscured. Above water, however, this spell can be difficult to see. A creature that starts its turn within 60 feet of the area and can see the area must make a Wisdom (Perception) check to notice the heat haze caused by this spell, and therefore notice the spell’s effect. The DC for this check equals your spell save DC.
At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd.
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