More than 1000 years ago, something catastrophic happened that would change the course of Equestrian history forever. A young Princess, angered by injustices committed against her, will give in to her jealousy and rage and be transformed into a Nightmare.

This is a tale you will not find in any history books. This is a tale of betrayal, sorrow, and so much bloodshed. The unsetting moon was not a singular event. It was a war. An ashamed Princess Celestia had censored and altered the tale so that, whenever her sister did return, she would not immediately be hated.

This, however, is the true story of Nightmare Moon.