Black Fireball

An illuminated ball of black flames streaks from your pointing finger to a point you choose within range and then blossoms with a low roar into an explosion of flame. Each creature in a 20-foot-radius sphere centered on that point must make a dexterity saving throw. A target takes 4d6 fire damage on a failed save, or half as much damage on a successful one.
Creatures that fail the saving throw are pushed back 10 feet from the center of the blast. If they collide with a wall object they take 2d6 bludgeoning damage.
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 4th level or higher, the damage increases by 1D8 Necrotic Damage for each slot level above 3rd.