Aphazard's Steam Cloud

A white-hot cloud of steam appears and fills a 50-foot radius sphere centered on a point you can see within range. The sphere spreads around corners and its area if heavily obscured. When you cast the spell, each creature in the steam's area must make a Dexterity saving throw. A creature takes 6d6 fire damage on a failed save, or half as much damage on a successful one.

At the start of each of your turns until the spell ends, the cloud's radius shrinks by 10 feet to a minimum radius of 10 feet, and you can use an action to force each creature in the sphere's area to make a Dexterity saving throw against the spell's effect.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the radius increases by 10 feet for each slot level above 5th.