An ancient manuscript written in Middle English, the only surviving artifact from long lost Earth, may hold the true reason for the emergence of Equestria.
At the heart of every Conversion Bureau is 'potion', the nanotechnomagical serum that converts a human into an Equestrian. But before the Bureaus, the serum had to be created first. This, is that story.
Sunset Shimmer had one friend before the events of Equestria Girls, a Diary. While she abandoned it as she spiraled into darkness now, with a chance of redemption, she turns back to the diary to help overcome all obstacles to make some real friends.
For Ditzy Doo. a developmentally disabled pony, an intelligence enhancement spell proves to be both a greater blessing, and a greater curse, than anypony could have expected.