A notion that has been on my mind for some time that I wanted to bring up. While it is something I doubt exists, I see no reason in particular why it couldn't necessarily, but perhaps that is ignorance on my part.
Just as the material plane has a counterpart around the negative energy plane in the form of the shadow plane, I figure why not have anything further? Are there, or at least could there be, reflections of the elemental planes or even further out centered around the negative energy plane? If such planes existed, what would they even be called, and what would they be like?
Even within the material, is the dark tapestry reflected in the shadow plane in some form? Im not expecting a shadow Cthulhu to be lying around somewhere in the shadow plane, but do the horrors get a counterpart there?