Curse of the Leech

You choose three creatures you can see within range. Each creature must make a Constitution saving throw or be cursed. A cursed creature takes 1d8 necrotic damage at the start of its turn and you regain hit points equal to half the damage dealt (minimum 1). A cursed creature can repeat the saving throw at the end of its turn ending the curse on a successful save.

At Higher Levels. When you cast this spell using a spell slot of 4th level or higher, you can target one additional creature for every slot level above 3rd.