Torturous Grasp

Once cast you may make a melee spell attack against a creature you can reach. On a hit, the target takes 3d10 necrotic damage. This spell cannot reduce the targets health below 1 hit point. The caster heals half the damage dealt to the target

If the spell end prior to the duration the caster takes 10d10 necrotic damage.

At Higher Levels. When you cast this spell using a spell slot of 5th level or higher, the damage increases by 1d10 for each slot level above 4th.