A few months prior, Starlight Glimmer drank a potion which showed the tragic demise of one of the worlds she affected when she sabotoged the first Rainboom. Now, she must undo the damage she's caused before it can get any worse.
Starlight won, or so she thought. Changing time without waiting for Twilight's return, she thought she succeeded. Upon leaving the past, she comes to a place she's never seen before. Fortunately, more than one pony in Equestria has fiddled with time.
Shortly before the return of Nightmare Moon, her daughter wants nothing more than to have Equestria fall into eternal night and Celestia ousted. However, when she meets a young batpony her plans for revenge will be put on hold.
Starlight did it, she passed her entrance exam and was accepted as Celestia's protege. Join her during her journey through school where she makes new friends, continues to expand her knowledge and helps other ponies with their studies.
Starllight Glimmer has won, she has made Equestria into her world where no pony is different where everypony and everything is the same. Everypony never feel down, with Starlight controling Equestria only four still have their normal cutie marks.