(In other)Time. With time, you can can not be killed if you stop time before anything that could kill you happens. You can live forever, can do ANYTHING you want when time is stopped, can lift anything because gravity needs time to react, therefore causing everything to be as light as air, can kill anyone with one punch because your speed would be so fast that it's force would be lethal, and the list goes on. Only problem is that you'd have to constantly be moving to keep clean air around you, because the air won't move alone.