Firestorm is one of the more underrated characters in DC. I'm not sure if his elemental powers will work on a herald though. And since crossovers aren't canon, does anyone know whether his subatomic conversion ability would work on power cosmic-like beings?
Edit: Xmeat, the reason is your forum rep is shit right now. Give it time. People will respond. You just have to build a better rep and make some good threads.