Chaos Fireball

A streak of fire and dark energy flashes from your finger to a point you choose within range and then bursts generating an explosion of dark flames. Each creature in a 20-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 6d6 fire damage and 6d6 necrotic damage on a failed save, or half as much damage on a successful one. Until the star of your next turn, the zone of the explosion is filled with a strange almost visible dark energy that syphon energy from the living. When the creature enters the area for the first time on a turn or starts its turn there, it must make a Constitution saving throw. On a failed save, the creature takes 3d6 necrotic damage and you can absorb the damage dealt that way as a Reaction, regaining Hit Points equal to the amount of necrotic damage dealt this way. On a succesful save the creature takes half as much damage and you cannot absorb the damage.

The dark flames 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 6th level or higher, the damage increases by 1d6 fire damage and 1d6 necrotic damage (both the explosion and the secondary effect) for each slot level above 5th.