Luna alone couldn't have been the sum of Nightmare Moon's entity. Some external evil force must have given her extra power... I identify exactly who and what this force is by analyzing the hidden clues strewn across the nine seasons of MLP:FiM. But what do you think brought about Nightmare Moon... and what is up with her cutie mark? Tell me your opinion.
I devised this theory back in 2017 while "A Royal Problem" and "Shadow Play" were fresh in my mind, but only decided to finally start making it into a video in early 2019. However, I was forced to cease production for a few months and some of the material became outdated over time, so I hurried to finish the moment I got back to work.
Faust's ponychan Q&A: https://www.equestriadaily.com/2013/06/lauren-faust-ponychan-q-compiled.html
Episode profile walls/collages from https://www.deviantart.com/dashiemlpfim and https://derpibooru.org/1042328
Video clips are taken from Luna's Determination, Lullaby for a Princess, Duo Cartoonist, and MLP:FiM. I also featured IDW comics, and created quite a bit of the artwork used in this video myself.
Other materials used in this video:
https://www.deviantart.com/johnjoseco/art/Another-Luna-Night-305637932
https://www.deviantart.com/sofunnyguy/art/Nightmare-moon-419573902
https://www.deviantart.com/tbirdman95/art/Young-Princess-Luna-front-view-1-751872691
https://www.deviantart.com/stelar-eclipse/art/Castle-Background-423085115