The Living Reaper

With this ability, you are granted limited powers of a reaper. 

Target needs to take a CON save of 18 - If they fail, they will be drained of (5+ WIS mod) HP. With this, you are able to give this HP to yourself or anyone within 10 ft (longer range when you cast higher spell level - (+CONMOD)ft for each spell level above lvl 3). However, if the creature you drain from is dead or without will, the HP you drain will be "tainted" and will also drain the same number of HP that you took.

If you cast the tainted HP onto another dead creature, they will gain the HP from the drained monster.