The Three Layers

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"We technically call these places "Pseudo Dimensions", but there's other names, such as Realms, or Planes of Existence." Rose said, suddenly conjuring some blood mist and manipulating it to resemble some sort of three-layered world. "Imagine our World as this. The middle layer is our Mortal World, the layer beneath is Hell, and the layer above is Heaven. In between, there are also several fluctuating layers, which might be smaller realms created by other really strong entities."