1 Health Spells from Necrotic arts

Feel out with your mind for the beings life force and simply pull it away from them. The important thing to do is act as a conduit for the life force to pass away from the being and 'free' it from it's binding to them.

This won't kill someone instantly so don't try it for that. It shortens the life span of anything (including anything in the way so be extra careful). In order to drain an entire life takes time.