You create a zone of latent arcane energy with a radius of 10 feet centered on a point within range. This area emits a harsh red glow and hums ominously. If you lose concentration on this spell before your next turn begins, the circle dissipates harmlessly. At the start of your next turn, the area erupts in an enormously loud explosion of fire. Each creature in the area at this time must make a Constitution saving throw. Creatures take 3d6 fire and 3d6 thunder damage on a failed save, or half as much on a success. The spell also ignites any flammable objects in the area that aren't being worn or carried, and deals only the thunder damage to any nonmagical objects in the area that aren't being worn or carried.
At Higher Levels: When you cast this spell using a spell slot of 3rd level or higher, the damage increases by 1d6 fire and 1d6 thunder for each slot level above 2nd.
* - (A small piece of obsidian)
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