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// Return of the Nightmare 
// Story: Drowning in My Own Nightmare 
// by Cadence5 
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          Luna spent her thousand years trying to figure out how to defeat Nightmare Moon, while Nightmare Moon spent hers being bored out of her mind. As their time began to change from years to minutes, Nightmare Moon became more excited for her turn at redemption.
When their last seconds of banishment were up, Luna once again felt the unearthly pain of Nightmare Moon’s soul being squeezed inside her body, and when she opened her eyes, she found herself in Ponyville. She had always quite liked Ponyville, but as she looked around she noticed that instead of her own body, she held the appearance of Nightmare Moon. Luna was led to what looked like a town meeting, and after a rather long, boring speech to the ponies gathered there, Nightmare Moon vanished taking Luna with her as she began to try to trick a few ponies who were wandering the Everfree Forest.
The six ponies found a way through every one of Nightmare Moon’s traps until they came to an ancient castle. Ad Nightmare Moon landed in the highest tower, she changed her appearance from Luna’s body to her own just as a single, lavender mare entered the room.
Luna wished she could warn the mare, whose name was Twilight Sparkle. Soon the other five ponies that Luna had seen in the forest came rushing in. Twilight’s eyes shined suddenly, and then Luna knew what Twilight knew. These pones represented the Elements of Harmony. 
Nightmare Moon was confused as each element was named along with the pony who represented it, but Luna understood as Twilight finished her speech revealing where the spark came from to unite the elements. If Nightmare Moon was still confused, there was no time for her to figure it out before she was hit by the colorful magic. Luna fell to the ground and Nightmare Moon was gone. 
Then Luna was being helped up off the ground, as she looked up, her eyes met her sister’s. They did not need to voice how much they had missed each other, for there would be time for that later. As the eight ponies walked back to Ponyville, Celestia explained what had happened to the six Element Bearers.
Then, after many welcome back parties for Princess Luna was able to return to Canterlot with Celestia where the two talked, discussing Luna’s letter from so long ago. Luna explained what had happened to her in the past one thousand years, and Celestia did the same. 
Eventually, Celestia went to bed as Luna rose her old prison in the sky, happy to be home and once again ruling the night.