PLEASE READ:
This PMV has a story behind it. Okay so Princess Luna used to look up to Celestia for guidance and wanted to be just like her but after Celestia locked her in the moon, things changed. Luna developed a strong hatred for her sister and wanted to show her that she was better than her. When she came back from the moon and returned to her normal form after Twilight and friends used the Elements, she kept wanting to become NMM again so she could defeat her sister but overcame that and waited. Then (near the end of the video) she transformed into NMM, and defeated Twilight. Celestia was angry, and then shocked to see her sister was evil again.She tried to fight Luna but her rage was unbearable and she killed her sister. Nightmare Moon was then the supreme ruler of Equestria. Thank you for reading all of this and it might become a fanfic later. Enjoy! My Little Pony Friendship is Magic is owned by Hasbro and Lauren Faust
I only own the video!