It's been two and a half years since the battle between Celestia and Luna took place. So bloody and fierce, but never written into Equestria's history. Twilight however, saw something amazing in that clash of these celestial titans:

A whole new sky had been created from the destruction.

Twilight, so entranced by it, recreated it, only making a few changes to it. She shared it with the citizens, who fell in love with Twilight's newest and greatest form of magic and art. Celestia however, disapproves of this creation, and in doing so, has begun the birth of one of Equestria's greatest enemies that it will ever know.