Talise's Tanglement of Triage

You create an ethereal link between one hostile creature and a friendly creature.  The link can appear in any form of your choosing, both visible and invisible.  For the duration of the spell, when you deal any damage to the hostile creature the linked friendly creature regains health equal to half the damage dealt (rounded up).  

At Higher Levels When you cast this spell using a spell slot of 3rd level or higher,  you may target one additional friendly creature for each slot level above 2nd.