What if the alicorns of Equestria aren't just representations of their various aspects, but are in fact, linked to their very existance?

This question had been bouncing around my head, and just kept gathering more and more details until I had to get it out for others to know my suffering.

Look, upon the Desolation of Elysium, and know despair.

Edit: I may revisit this at some point and tweak it a bit, but mostly I just needed to get the idea out there before it joined so many others in the dusty, forgotten corners of my mind