Regarding RWBY
Auras and Semblances are... interesting, namewise. A semblance implies that they are instead of something, in this case magic.
But the second set of humanity and the Faunus, both, didn't actually have access to magic. So why would they call them semblances on their own? How would they know what they're missing?
The fact they can use their aura or souls as shields is also interesting because, again... something doesn't feel right. I don't think either developed alone.
But someone awoke in a world surrounded by monsters, with people who could not truly fight back or protect themselves. With faunus in cages and people dying left and right. They were given a mission to unite humanity, how can that happen if everybody dies?
Ozma's magic is weakening, but there's no explainable cause? This might be that cause. I think anyone's might be, if they gave out a tiny piece of it to every human and faunus on Remnant. The maidens got a lot, yes. But everybody got a tiny portion. Might even be why aura is unlocked through a prayer... Ozma thought it was going to the GOL. It wasn't.
Whether that will have any real effect on uniting humanity is another matter. Ozpin and probably several previous versions wouldn't tell anyone, since even that would never feel like enough.
But would Oscar, once he realises why? Why his magic works like an overpowered version of an Aura and a Semblance... and what that means?
What Ozma did to try to help humanity save themselves weakened him, is still weakening him.
But may have saved them all.