Black Fireball

A maelstrom of swirling black fire appears near your hands. On your next turn, you choose a spot within range as an action, provided this spell has not ended. The maelstrom disappears from your hands and reappears centered on that point, growing exponentially. Each creature in a 30-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 6d6 fire and 6d6 necrotic damage on a failed save, or half as much damage on a successful one.

The fire spreads around corners. It ignites flammable objects in the area that aren't being worn or carried.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d6 for each slot level above 5th.