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 hasn't ended. The maelstrom disappears from your hands and reappears centered on that point, grown 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 maelstrom spreads around corners. It ignites flammable objects in thearea that aren't being worn or carried, and it withers nonmagical plants.

At Higher Levels. When you cast this spell using a spell slot of 6th level or higher, the damage increases by 1d6 necrotic, and 1d6 fire, for each slot level above 5th.