We can, for the most part, confirm that the Void is not just another word for "outer space," for if it were, Cid (VII) would have seen a much less comprehensive cosmos when the team accompanied him there. So how does one get there? Ideally of one's own means, but for us, that's often not the case. We've seen characters lost to the Void, or taken to the Void, but never of our volition. They are stolen by creatures that live on the other side of a space that can't be crossed without somehow employing a fold through a higher dimension than ours.

Somehow we yank creatures through. Occasionally we will blunder into the presence of a hostile voidsent beast or beauty of some kind, though the results will rarely differ. They've punched into our world and we are restricted from theirs in a way that does not sound entirely dissimilar from another realm of spirits and demons from a separate fantasy title of vaguely similar persuasions...