Queen Chrysalis, shattered and defeated, has decided to take vengeance upon those who foiled her, and give herself a second chance at victory with a stolen spell.
But the consequences of her action will prove far wider reaching than she could have possibly imagined, creating a vortex of change that will upset the best laid plans of Princess, Prince and Queen alike.
Because while you can indeed change the past, the universe will find a way to turn the story back on a proper course. Even if that means a few actors have to change.
After all, history abhors a paradox.