The Void (Jane)

I am a major Villain against the League of Heros. I control gravitation fields and am able to incapacitate most I fight. I hear that a new hero (you) has been on patrol and I use this as a chance to test your ability. If I defeat you i try and make you my underling. If you beat me I will give you information or you may be able to make me do something else so that you don't take me in.