Luna in the Everfree Forest.
Luna turned her head quickly. ''What was that?'' she questioned. She was scared because they might reveal her to Princess Celestia. Luna walked slowly to where the noise was coming from. It sounded like a snake. ''He-hello?'' Luna dicho aloud. ''Is anyone there?'' King Sombra heard the voice. he smirked and said, ''If I can get the Princess under my spell, I can get the crystal heart.'' Sombra got closer to the voice. Princess Luna gasped and said, ''Who are you?''. 'I'm Celestia's worst enemy.''King Sombra replied. ''What did tu do to her?'' asked Luna. ''I'll tell tu the story....''.
''Twilight! Twilight! There's going to be a carnival going on today at the Crystal Empire!'' Pinkie said. ''Really? I think I have some time on my hooves for that.'' Twilight said. ''Yay! Do tu want to go with us right now?'' Pinkie asked. ''Sure, I'll go get Spike.''
''How dare my sister says that about me! If she doesn't have feelings for me, I do not either!'' Luna exclaimed. ''She even told me that Equestria was better off with out you.'' Sombra said. ''I will never forgive her!'' she said. Luna shed a tear and when it hit the ground, she turned into Nightmare Moon.
King Sombra talking to Luna.
Princess Luna crying.
Luna transforming to Nightmare Moon
Pinkie telling Twilight of the Carnival