Saving the Void? (Time travel) - future expansion idea?

[KageTokage]

I feel like Eden is setting up something regarding the void; namely that it might not be as hopeless of a case as everyone thought it was.

Or at least I don't know why else a warrior from there who's suggested to be the Oracle of Darkness would show up out of the blue, as if her role is the same as that of the Oracle of Light, it's to bring balance to her world.