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 the spell hasn't ended. The maelstrom disappears from your hands and reappears centered on that points, grown exponentially. Each creature in a 30-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 9d6 fire and 9d6 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 the area that aren't being worn or carried, and it withers non-magical plants.

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