Black Maelstrom

A maelstrom of swirling black fire appears in your hands. On your next turn, you choose a point within range as an action, provided this spell hasn't ended. The maelstrom shoots from your hands to the chosen point and grows exponentially. Each creature in a 20 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 on a success.

The maelstrom spreads around corners. It ignites flammable objects in the area that aren't being worn or carried, and it withers nonmagical plant life.

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