Time Steal

You attempt to steal time from a targets life. The target must make a Wisdom saving throw. On a failed save, the target takes 1d6 Necrotic damage and you regain HP Equal to half the total Necrotic Damage dealt. Spell has no effect on undead, Or constructs. 

This spells damage increases by 1d6 at 5th level (2d6), at 11th level (3d6), and 17th level (4d6)