Ancient magical artifacts and untested spells really shouldn't mix. After a misfired spell on Star Swirl's Mirror ends in Twilight, Sunset, and Spike trapped in a foreign universe, they must find a way back to Equestria.
A King woke up from a coma and realizes that the legacy of his ancestors is threaten. To protect his subjects, and their nation he send a messanger to Equestria... hoping that his pride did not mean the end of Nocturia.
An incarnation of King Sombra is born in the body of a filly and wanders off on her own until she comes to Ponyville where she meets Fluttershy who takes her under her wing. Later her dark half breaks free and Queen Arbmos takes the Chrystal Empire.