The Fifth-Dimensional Gateway

The Fifth-Dimensional Gateway is a mysterious and ancient realm, existing parallel to nearly all timelines and realms alike.

Unlike anything natural, cosmic or otherwise, the Fifth-Dimensional Gateway is entirely artificial, and infinitely expansive in every stretch of the word. Beings and civilizations alike sprout and live out their natural lives in this parallel realm, all destined to fade into the past like everything else has. And while the true original creator of the Fifth-Dimensional Gateway is totally unknown, it still serves as the de facto capital of all interdimensional travel, everywhere.