Talk:Princess Luna/@comment-5892513-20141221140614/@comment-26973802-20141227203756

@Missygirl156 You should watch Princess Twilight Sparkle. It shows her transformation onscreen.

Also, if you're implying there is a connection between Nightmare Moon and King Sombra, I agree with you there. My headcanon goes that when Celestia and Luna fought Sombra, Sombra could sense Luna's jealousy of Celestia and cast a curse to magnify it before they banished him. (his curses are established to survive his banishment after all) And once it got strong enough and drove her to turn on Celestia, that was the final step causing her bitterness to take a form of its own and transform her into Nightmare Moon.