Once upon a time, in the magical land of Equestria, there were two regal sisters who ruled together, and created harmony for all the land. To do this, the eldest used her alicorn powers to raise the sun at dawn; the younger brought out the moon to begin the night. Thus, the two sisters maintained balance for their kingdom and their subjects, all the different types of ponies.

But as time went on, the younger sister became resentful. The ponies relished and played in the day her elder sister brought forth, but shunned and slept through her beautiful night. One fateful day, the younger alicorn refused to lower the moon to make way for the dawn. The elder sister tried to reason with her, but the bitterness in the young one's heart had transformed her into a wicked mare of darkness: Nightmare Moon. She vowed that she would shroud the land in eternal night. Reluctantly, the elder sister harnessed the most powerful magic known to Equestria: the Elements of Harmony. Using the magic of the Elements of Harmony, she defeated her younger sister, and banished her permanently in the moon. The elder sister took on responsibility for both sun and moon and harmony has been maintained in Equestria for generations since.

However, when Nightmare Moon returned, a brave young student of the elder sister, Twilight Sparkle, aided with her friends, returned Nightmare Moon to the younger sister she once was. After since, Twilight Sparkle and her friends have gone on many adventures, from stopping and reforming the spirit of chaos, Discord, to stopping Queen Chrysalis and her Changeling army from taking over Equestria, to reviving the Crystal Empire and vanquishing King Sombra.

One day, Twilight Sparkle created a new form a magic, something that not even legendary wizard, Star Swirl the Bearded, could do. For that, the eldest sister dubbed her a princess and made into an alicorn. However, as the weeks and months passed on, the new princess felt as if her new position in power was meaningless. She slowly became resentful, but unlike the younger sister, Twilight had her friends to keep her happy. However, when the centaur Lord Tirek came into Equestria and began to steal everypony’s magic power, the princesses called upon Twilight’s help to hide their magic away. Tirek kidnaps her friends and lets her trade them for the alicorn magic. But, he unknowingly gave her the key to an untold magical power within the Elements’ origin: the Tree of Harmony. She unlocks this power and she and her friends gain the ultimate power of friendship to seal Tirek back into Tartarus.

After her latest battle against Tirek, Twilight became happy with her position, and to this day, nothing has happened to her and her friends…

However...

What if things down the line went a bit differently, what if a tiny change to their world occurred?  It may seem insignificant, but anything, even the seemingly most worthless things, can leave a huge impact upon a world…