Tomb Blast

a iron maiden forms on a point in range slams  shut causing the blood and energy of the creature to return back to the caster healing them in the process. Each creature in a 20-foot-radius sphere centered on that point must make a Dexterity saving throw. A target takes 6d6 necrotic damage on a failed save, or half as much damage on a successful one. it heals the caster 1d10 if it hits a creature.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, the damage increases by 1d6 for each slot level above 3rd, and raises the healing affects at 5th level by 1d10 and 7th level, 9th level.