Princess Luna was the younger of the two sisters who ruled over canterlot. Her job was to raise the moon and to watch over the dreams of ponies all across equestria; however, Luna felt jealous of her elder sister and betrayed by her ponies. This feeling allowed a darkness inside her to take control and to transform her into Nightmare Moon. Princess Celestia, Luna's older sister, made the decision to banish her sister to the moon in order to save their subjects. What she didn’t know at the time was that sending away Luna would set free an ancient beast, The Lorik.