Molten lava begins to burst out of a point on the ground that you can see within range, creating a 1-foot thick layer of lava on the ground that fills a 30-foot radius area centered on that point. The lava spreads around corners, and is difficult terrain.
When a creature enters the spell's area for the first time on a turn or starts its turn there, that creature must make a Dexterity saving throw. On a failed save, a creature takes 10d6 fire damage, and is ignited for the duration. On a successful save, a creature takes half as much damage and is not ignited. The lava also damages objects in its area, and ignites flammable objects that aren’t being worn or carried.
An ignited creature suffers no additional effect while it remains in the lava. However, if an ignited creature starts its turn outside of the lava, it takes 2d6 fire damage as it continues to burn. The effect ends after 1 minute, or if the ignited creature or another creature within 5 feet of it uses an action to douse the flames.
At the start of each of your turns, the lava spreads out further, increasing the radius of the area by 10 feet. The lava spreading into a creature’s space does not damage that creature until it starts its turn in the lava.
At Higher Levels. When you cast this spell using a spell slot of 8th level or higher, the damage increases by 1d6 for each slot level above 7th.
Source: Blazing Dawn Player's Companion
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