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Heaven and Hell, two "Planes" that are between a Realm or a Dimension, which coexists with Earth, which is the middle part of the two.
Like a sandwich, Hell is below and Heaven above, while Earth, the Mortal Plane, is the center of such a sandwich, both sides influence the one in the middle, while constantly trying to destroy each other with their own factions.
I experienced that firsthand when I accidentally turned myself into something like a half-angel by absorbing Angelina's materials… And the worst part is that, because they live between these Planes, not even Awakened people can normally see these entities.
The reason I was able to see them was because of what I ended becoming… But nonetheless, knowing that Hell might be somehow connected with Arcadia only brings me more questions.