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Katherine was a very talkative fairy, and although she hadn't been summoned to the "Human Realm" for over a thousand years, she was still very knowledgeable about many things we didn't knew ourselves.
One of them was the existence of "Realms", they were for a lack of a better word, small worlds of their own that existed between the three layers.
The Heaven Layer, the Mortal Layer, and the Hell Layer. Avalon would be located between the Heaven Layer and the Mortal Layer, it wasn't a Realm as big as the planet itself, but it was big enough for billions of living beings to exist there.
