The Equestrian Empire will fall.
Those are the words of Starswirl Stabledon—the first and greatest psychohistorian. For he has applied his science to galactic society and, in doing so, has seen the truth. The mighty Empire, which has stood for over ten millennia, will regress, break up and succumb to chaos. Lacking unified leadership, twenty-five million equine worlds will turn against each other and unleash a dark age without foreseeable end.
Skepticism over Stabledon’s findings leads him to be targeted. His predictions have placed not only him, but also his large group of followers in jeopardy, setting them on a millennium-long path that will change the future forever—a path that must be traversed if harmony is to survive.

Note: This is a crossover that takes the characters of My Little Pony: Friendship is Magic and places them in the setting of Isaac Asimov's Foundation Series. The reader does not need prior knowledge of Foundation to understand this crossover.