Literature
Equestria: Across the Multiverse - Prologue
“When considering the history of multiversal exploration in Equestria, one must remember that the groundwork for travelling between universes was already established long before the time of Princess Twilight. While it is true that Princess Twilight had begun the modern age of multiverse exploration, she merely perfected the method of traversing parallel worlds into a practical form, and her endeavors began as a private project exclusive to only her and her companions.
Even so, however, without her insight into the full implications of its potential, modern trans-universal colonization and commerce would never have occurred. And without
