As to the original point of the post, the void as we know is the space between Multiverse realities. It is outside the multiverse and is the same realm for all of them (unlock say, the Realm of Discord, which each reality has its own version of the Realm - the Void is singular, and only exists once but simulaneously connected to everything) I think that as a source of energy it is unparalled, and thats why so many Villains seek it and heroes defend it.