Fractured Hooves
Equestria wasn't always so torn apart, but after what Opaline did it was never quite the same for a long time.
There was once a time when Equestria wasn't always so fractured. Where the air, was once filled with the harmonious melodies of laughter and banter. Now it only carries whispers that echoes the beliefs of a forgotten Alicorn.
Opaline has always been in the shadows. Her resentment always growing stronger and more out of control. She never had the limelight, no one even remembered her. But they'll know her sooner than they know.
She watched from afar. Staying hidden until it was the perfect moment to strike. When Twilight was made an alicorn, it made her blood boil. How DARE THEY. They taint the legacy of Alicorns by allowing a mere Unicorn to join their rank.
Resentment has always followed Opaline. They just didn't understand just how special she was. They just had to see Celestia and Luna as perfect. They never gave her the same attention. It drove her to despise the two sisters.
Always trying to one-up them, only to be ignored. While they got praised. They'll see what she's been planning all this time.
When Twilight was crowned as the sole ruler of Equestria, she knew it was the perfect time to make her move. Diqusing herself as a mere Unicorn and working her way to becoming Twilight's head student. It was almost too easy.
Getting close to the newly crowned ruler was even easier. Once Twilight was none the wiser. She sneaked out and started causing disharmony among the inhabitants of Equestria. Telling each one that they were better and deserved more. In secret of course, never showing herself fully and only covered by a hooded cloak.
When the harmony the princess of friendship worked so hard to gain finally started to fracture. She took to slowly draining magic. Where it came from the environment or any pony didn't matter. With the princess busy trying to mend relations, she was able to gather enough strength to finally confront the new ruler face to face.
Finally breaking the illusion of being her head student and revealing her true glory. She relished in Twilight's mortification as she listens to her actions and realizes what happened. The fight wasn't to Oplaines satisfaction and she escaped. Weakened, but still strong. Twilight decided to put all magic into gems. Creating the Unity Gems and giving each of her friends a piece to hide away in the farthest corners of Equestria.
After another confrontation, she was humiliated. Twilight in a last-ditch effort tricked her into a faraway palace and bound her to roam these halls. This wasn't without it's own issues, Twilight also suffered from this final confrontation. Being severely weakened and wounded she fled to recover.
Leaving Opaline alone and enraged.