twilight sparkle and nightmare moon by UntiltheBalloons on DeviantArt
2126816 - safe, artist:mlp-firefox5013, nightmare moon, the cutie re-mark, alternate timeline, armor, fangs, implied spike, implied twilight sparkle, nightmare takeover timeline, now that's something i would like to see, offscreen character, open
Celestia vs. Nightmare Moon HD 1080p - YouTube
Princess Luna turns into Nightmare Moon - Princess Twilight Sparkle - Part 1 - YouTube