[@Solaris] So uh, the whole healing from stealing life force thing I get it. But it doesn't seem too practical. I mean would you just absorb people by touching them in the arm, would you actually have to kill them first?

The reason I'm asking is... say you got shot in the face. The healing is spontaneous yes, but there would be no way to pay the cost in time unless you had something to kill literally as your head is being blown off. It's not like your body will let you live and wait a few minutes until you kill something. 

The only way I could see the power actually working is if you suffered a non-fatal injury, or you could use it premeditatively, other than that it would be useless against any killing blow. 

I also am confused on how the immortality part will work

You see what I'm getting at? Besides, I don't think anybody would want to be in a five foot radius of you in the group if you ever get injured. Just saying.