The Elements of Harmony didn't activate. With only one of the six artifacts there in the human world, how could they? Twilight and her human friends, despite all of their efforts, were vaporized in an instant by the newly empowered Sunset Shimmer. Sunset then turned her attention to Equestria.
It was a disaster. Celestia and the other princesses drove her back almost as soon as she stepped through, and the portal sealed behind her. Nor did her newfound power go unseen. Three sirens, trapped in the human world and desperate for magic, took notice. So did another: A human girl with a sharp mind and great promise, who hopes to someday do great things.
So begins a three-way struggle for the Element of Magic and the power it holds. So begins the Battle of Canterlot High.
Rated Teen for violence and minor blood.
(My cover art skills are weak. Looking to commission real cover art.)