Nightmare Moon's mane is made of floaty, starry, purple mist, and she transforms into a sinister mist several times. She appears out of the mist in Ponyville's pavilion where the Summer Sun Celebration is being held, and she leaves the pavilion in a similar way, flying out into the night. The mist floats by Twilight's library window as the ponies learn that the Elements of Harmony are located in the "Ancient castle of the royal pony sisters"; it follows them throughout their journey.