Once upon a time, in the magical land of Equestria there were two princesses who ruled over the land in harmony. The elder sister used her unicorn magic to raise the sun in the morning and the younger sister used hers to raise the moon at night. However, the younger sister soon grew jealous of  her sister. The ponies would play and relish the day that the older sister provided, and shun and sleep through the beautiful night she brought about. One night, she refused to lower the moon. The elder sister tried to reason with her, but she was consumed by darkness and had transformed into a vicious mare, Nightmare Moon.

Well we all know after that Princess Celestia used the Elements of Harmony to defeat her and then banish her to the moon. But what if the story wasn't how we thought it was? What if things were different...?