To change the future of Equestria

Dark Eater woke up in cell, he quickly looked around and began processing what had happened. 'Okay, I must have lost, my gem was destroyed by a future version of Fluttershy. Hmmmm..... I think I get it now. Well, I never would have imagined there would be a weapon that could destroy the gem I made to counter the Gem of Keys. The gem I mad was a perfect replica, it just needed more power.... I guess for now, I need to find out where I am.' He then quickly realized his horn was locked, meaning he couldn't use magic and he chained up in a small dinky iron cell. He then smiled, 'This will be easier than I thought.'

Meanwhile, In a room in the Canterlot Castle, Sunset Shimmer, battered and beaten had just woken up.

“What do you mean Sunset?” asked Twilight.

“The gem Dark Eater had on him is a fake created by him to counter the real Gem of Keys.” replied Sunset Shimmer.

“And the one who has the real gem is going to attack Equestria High?”

“Yeah, there is a good chance that may happen.”

“Hold on.” said Celestia, “Sunset Shimmer, who is Dark Eater and why does he have a fake gem?”

“Princess.....before I start, can I please tell you something?”

“Of course.”

“I'm so so sorry for what I did so many years ago, I'm sorry I hurt those guards and when I came and stole the element of magic.” she said as she began crying.

“It's fine Sunset, I have already forgiven you.” she said as she nuzzled he head by the bedridden Sunset.

“I'm sorry if I attacked you all while under Dark Eater's control.” she said to the Mane Six.

“It's fine darling, please go ahead with your story.” said Rarity.

“Well, I guess I should start from the very beginning, when I first went thru the mirror. It was then I first met Dark Eater.”

“That far back?!” asked Twilight.

“Yes, he also went to Equestria High, and he knew instantly who and what I was. I remember that day like yesterday, He confronted me and told one simple thing, 'If you wish to stay in this world, if you wish to not be found out you must do two things.' and then I asked, 'Two things?', 'Yes, show how you got here and never ever go back to your world. If you ever go back to this Equestria, you may never return here. If you do, I will reveal everything to everyone here and then I will destroy you. Unlike you, I know how to access magic in this world, unlike you who has lost her horn, being turned into a human.' is what he said.”

“Wait a minute, if that is true, why did you come back and steal my crown?!” asked Twilight.

“He had left town for a week and I thought it would be my chance to finally be able to fight him back. It was the power the element of magic gave me that caused me to want more.”

“Then why were you the popular one in school? Why would he allow that?”

“He didn't care what I did as long as I didn't go back to Equestria.”

“But why?”

“He told me that if I went back and forth from Equestria it would cause the balance of both worlds to be broken. The human world must not have a source of magic. The human world would fall apart if it did.”

“Then why did he go thru the mirror? If he didn't want the balance to be broken why do something that could or make a gem that could?”

“I don't know” said Sunset weakly, “All I know is that he found out what I did and then the rest is a blank until I woke up here. That must have been when he hypnotized with his magic.”

“It seems we have no choice.” said Celestia, “We will have to talk to him directly.”

At that moment a guard came in, “Your highness, the prisoner is awake now just like you requested.”

“Excellent, Sunset will you be okay if we leave for a bit?”

“No, go ahead. I need some rest anyways.”

They all went down to the dungeon and then stood before Dark Eater's cell. He stood there with a menacing smile.

“Well, well, well, you finally came. Greetings, Elements of Harmony, its nice to finally meet your pony versions. Though I could rather not see a version of the rainbow haired piece of garbage there.”

“Hey, don't insult the princess!” yelled Rainbow Dash.

“Be quiet Loyalty, she's a piece of trash that doesn't know its trash, which means she has no true right to exist in my eyes!”

Celestia stood unflinching and asked calmly, “I'm guessing you don't like my human version of myself.”

“Shut up you piece of filth, I don't like any version of you. I don't mind the rest of you however. Though I must say, its nice to finally meet you Twilight Sparkle, element of magic. From what I've heard you are quite the smart unicorn. That and you beat Sunset Shimmer.”

“Flattery's not going to work with me Dark Eater.”

“I know, I couldn't resist though. So, dear elements of harmony and rainbow hag, what would you like to know?”

“First, why are you here?”

“I'm in this cell cuz a future version of her over there,” in which Dark Eater pointed at Fluttershy, “blew up my gem I made.”

“How did you make a Gem of Keys?”

Dark Eater looked at Celestia and then spoke up, “You don't fully know what the Gem of Keys is do you? Hahaha.... Starswirl really didn't trust you did he?”

“....Yes, I did lose his trust once but he still trusted me with many other things.”

“Stop lying to me you stinking piece of garbage, if he really trusted you he would of told you what the gem really was.”

“It is recorded in our forbidden archive here in the Canterlot library as a gem that could defy the elements of harmony.”

“That's all the info you have, isn't it?”

Dark Eater then put on a huge grin on his face and began laughing hysterically, “Heheheheheh....HAHAHAHAHAHAHA....oh how rich....hehehehehe....you really don't know..”

He paused and then began again, “Very well, I'll tell of the gem's origins. It's your fault is exists anyways, well that and your moon loving sister's fault.”

“What did you say?!”

“Did you ever consider that removing the Elements of Harmony from the Tree of Harmony would cause even greater magic to appear in Equestria?”

“...What do you mean?”

“I know for a fact that some of the papers and reports of Starswirl the Bearded are lost in the archives in this world, am I correct?

“...Yes.” Celestia said bluntly. “They're in the human world aren't they?”

“Correct, they were given to a certain family in the human world along with the gem, as the gem's power was severely weakened just being in the human world. At the time he put the gem there, it was the only magic item in that world, though later he dumped more magic there no realizing the imbalance it could cause to the human world. Heh, heh, heh, you must have really betrayed him you rainbow colored wench.”

“Stop insulting me and continue, tell us everything.” Celestia demanded.

“I will keep insulting you till you believe you are exactly what I say you are hag. Anyways, do you know why the gem was made? Wait don't answer that you're stupid. It was created to counter your Element of Harmony reign of terror back when you had just beaten Discord.”

“What? How?”

“King Sombra, or more percisely, servants of King Sombra. He had sent spies to your kingdom and felt threatened by your power those many moons ago when he was still just a dark unicorn. He then tasked several dark craftsponies hidden away from his empire to create a weapon to defeat you 'Alicorn Sisters'. Unfortunately for him, the weapon was completed after he had already been beaten by you two, so instead his servants hid the gem. However, as you can guess, Starswirl found and defeated them. There, seeing the power the gem held, he must have told you about it but at the same time got rid of it by himself. Not only that, he left behind several papers and reports detailing incredible feats of magic that he believed Equestria was not ready to know.”

Celestia was taken back by the information she had heard but Dark Eater continued.

“Seeing at the time that magic does work in the human world unless a magical artifact is brought into it, he believed that humans would not be able to use the gems. My ancestors helped him and hid the gem and the papers he had wrote. A few generations later I got my hands on the papers he had left and began making my own advancements of magic in the human world and then hilariously enough you did something else that caused all the hard work Starswirl did to make sure the worlds will be kept in balance!!! Hahahahahaha!!!!”

“Stop Laughing!” exclaimed Celestia in anger.

“Oh shut up you piece of rotten, disgusting, overweight, sun-loving, piece of sewage filth! You're the reason half of this garbage happened to this world and the human world! You're the reason Sombra had the gem made, you're the reason Starswirl had to use the human world instead for a safe place for the gem to hidden away, and you're the reason the imbalance began to happen because you failed to keep your little apprentice Sunset in check. Remind me why I should even acknowledge a despicable, arrogant, vile, filthy, disgusting, trashy, rainbow-filled piece of pony garbage like you?!!!!”

“Why you little-” said Rainbow Dash before she was interrupted by Celestia.

“That's enough Rainbow Dash. Tell me one more thing, why did you attack our world?”

“....Despite my hatred for you, there is one person I hate more, the current owner of the Gem of Keys, my father, Violent Tempest. As for why I came here, it was to obtain enough power to defeat the Gem of Keys by any means necessary. Not only that, I believe there is a very good chance he is about to come to Equestria and when he does, this world will die.”