[@Enalais]

Honestly, I'm alright if you want to do a reverse as well. Your abilities can heal, correct, then have a weaker version be able to take life force as well. As the story progresses, we can have you develop that. A really cool thing you could do is have the color of your hair change with whatever its doing. Green for giving life force, red for taking it. 

Let me know what you think!