Damning Darkness

Damning darkness is similar to the Darkness spell except that it also deals necrotic damage. When a creature enters the spell's area for the first time on a turn or starts its turn there, that creature must make a Wisdom saving throw. On a failure take 2d6 necrotic damage, or half as much damage on a successful one.

As with the Darkness spell, the area of darkness is a 15-foot-radius sphere, creatures with Darkvision cannot see through it, and non-magical light cannot illuminate the area. Its source can be shrouded to block both the darkness and the damage affect. If any of this spell’s area overlaps with an area of light created by a spell of 4th level or lower, the spell that created that light is dispelled.