"Any regular old unicorn can do magic. That's nothing special." Years ago when they were fillies, that's what Twilight told Trixie. What if Trixie had listened?
Finally, Roseluck's special project is complete. Now, it's time for her to request an audience with Princess Luna, and see if her rose really does give her luck.
After Rainbow Dash accidentally says the wrong two words to exactly the wrong unicorn, she learns a lesson about the power of language -- in more than one way.
Twilight changes Star Swirl's time spell to travel back to the past once more. She ends up in the Pre-Equestrian era and unwittingly saves two fillies in the process. Little did she know what teaching them magic can do for the fate of Equestria.