Burst of Darkness

A ball of darkness appears at a point you can see within range, immediately exploding into a supernova of necrotic darkness, swelling outward to a 10-foot-radius sphere centered on the point.

Each creature in a 10-foot-radius sphere centered on that point must make a Dexterity save throw against your spellcasting DC save throw +2. A creature takes 6d10 necrotic damage on a failed save, or no damage on a successful one.

Each creature in a 5-foot-radius of the center must make a Dexterity save throw against your spellcasting DC +2. A creature takes 6d10 necrotic damage and 2d8 force damage or are knocked prone (DM decides at the time) on a failed save throw. On a successful one, the creature moves to the outer section of the radius and is required to make a Dexterity save throw to avoid all damage.

Using all your energy above a 3rd level spell slot, you are limited to a maximum of 3rd level spell slots until you finish 2 long rests.

At Higher Levels. This spells damage increases by 1d10 when you reach 16th level (7d10), 18th level (8d10), and 2d10 when you reach 20th level (10d10).