Following the Changeling Invasion of Canterlot, Twilight's friends, Princess Celestia and Shining Armor lament over how they failed to protect Canterlot from the Changelings as well for their behavior towards Twilight at the Wedding Rehearsal.
Twilight Sparkle faces the end of the world as she knows it. An epic three book series depicting the fall of Equestria and the rise of a new nation from the ashes.
Twilight writes to Princess Celestia for an explanation of an insidious issue Shining Armor told her about... but she ends up finding a secret that will change her life forever.