Transfusion

When an ally is unconscious within range, you can use your action to siphon blood from a fallen humanoid enemy (that has been dead for no longer than a minute) to attempt to renew your ally. 
When you put your hand on an ally and a fallen humanoid enemy within 5 feet of you, make a successful DC 15 medicine check, and a magical transference with occur, healing your fallen ally for 3d12+12 hit points and bringing them back to consciousness.

On a failed check, the spell and it’s components are lost