Chrono-Drain

You drain the temporal energy from a creature, forcing them to make a Constitution saving throw (DC 17). On a failed save, the creature takes 6d6 necrotic damage, and you regain hit points equal to half the damage dealt.

At Higher Levels: When you cast this spell using a spell slot of 7th level or higher, the necrotic damage increases by 1d6 for each slot level above 6th.