When Luna awoke from being knocked out from unknown means, she was greeted by the queen of the changelings, Chrysalis. Instead of spewing questions to Chrysalis, Luna rose from her bed and clutched her flat stomach.
She made her way to the bathroom to confirm what she knew, she no longer was carrying a baby within her. Fear crawled in her skin like a child warming up in a blanket. She made her way to the throne room in hysterics. When she got to the throne room, Celestia was seated with an unexplainably blank look on her face.
"Sister, what happened? Why am I no longer pregnant? What have I missed?"
Celestia only said, "I did what was right for my kingdom, sister." Luna held on to her rage as best she could. She left the throne room to find a guard to learn more of what Celestia would more than likely not tell her.
She returned to her room to see Queen Chrysalis on her bed looking more depressed than she had ever seen. "Queen Chrysalis, please tell me what is going on!" She looked directly at her and said,
"Let me start from the beginning. You have been unconscious for a week. Princess Celestia was completely sick of the king and his ways. She went to my kingdom and offered me all the love I needed to feed my changelings for a thousand years if I impersonated you. I agreed to this and together, me and Celestia sealed King Sombra in the arctic north, she was hoping forever. Instead of doing as she said she had agreed to, she betrayed me. I am now a powerless changeling queen who has to work her way back up to power. I, am so so sorry about your child Luna. She called for an abortion the first day you were unconscious. I know what it is like to lose a child."
Luna was hyperventilating and seeing red. Her eyes turned into slits and a dark manifestation of a dark aura encircled her mane and tail, changing it into the flowing mane like Celestia's mane. Hers looked like the night with stars twinkling within it. She became blacker than the night itself and adorning armor reminiscent of the times of Great War belonging to Commander Hurricane. "Luna! What has happened to you?"
The mare infront of Chrysalis spoke in a sinister voice unlike her own, "I am not Luna, You may call us Nightmare Moon. Chrysalis, you have been a great help to us by informing us of what has happened. Remain in the castle, I have something very specific planned for you in the future."
Chrysalis did not like the thought of being called upon like some animal, but she did as she was told. Perhaps she would come through for her.
Nightmare Moon made her way to the throne room to confront their sister. Celestia was shocked to see an alicorn with the same height as her. Before she could comment on this, she was caught off guard by a spell that blasted her through the wall. "YOU KILLED OUR CHILD YOU SLUTTY ROYAL BITCH!"
Celestia tried to get up, but was knocked back down. "Discord turns on you, so you decide to do the same to every pony else?"
Another blast knocked her out wall and into the forest. Nightmare Moon followed. "Did you think, I would just accept, what you did to me? To Chrysalis? To my King? To my CHILD?!" With every question, and every pause, Nightmare Moon slammed Celestia's face into the castle until she was knocked through the wall by facial force. Celestia tried to crawl away, but Nightmare Moon grabbed her by the hind hooves. "Where the fuck do you think your going, sister." She said with great disgust. She lifted her and spun her around. She then tossed her out the castle again, through another few buildings, and down a cliff. Celestia slowed herself down at first until Nightmare Moon rammed her horn into her stomach, making her lose focus. She pulled out her horn and grabbed Celestia in a very tight hug and shot down like a rocket, letting her go once the ground was close enough. When she collided with the ground, her legs were sticking out like carrots. Nightmare Moon pulled Celestia out with her magic, and immediately slammed her back into the ground. She left Celestia where she was and flew to the base of the cliff and shot back down faster than a rocket, and slammed all four hooves into Celestia's body. She proceeded to do this ten more times. When she finished, she pushed down on her back with her hooves and bit into Celestia's wing. Nightmare Moon began to rear back keeping a firm hold on Celestia's wings and ripped off her wing with her teeth and fangs. She did the same to the other one as well. The blood curling scream Celestia released could haunt even the cruelest of Ursa Majors. Afterwards, Nightmare Moon proceeded to lift Celestia above her head and blasted her back up to the base of the cliff. While in mid air, Nightmare Moon bucked her in her side, throwing her back into the castle. Nightmare Moon came back into the castle to Celestia and held her up by her mane. She ripped it out, shortening it into choppy, stubby uglyness. Nightmare Moon lifted her by her throat. "Why did you betray us and King Sombra sister? We did nothing to you. Was it worth it?"
Through the blood caught in her throat and the exceeding amount flowing from what used to be her royal body, Celestia breathed out, "I'm so sorry, Luna. I was doing what I thought was right for the kingdom"
A shred amount of rage turned to forgiveness as her eyes turned normal for a brief moment. This was shortly lived as her eyes returned to cold unforgiving slits. "The same cannot be said for my child, monster."
Nightmare Moon looked directly above Celestia's head and concentrated a very large amount of magic.
CRACK
Nightmare Moon broke Celestia's horn off down to a stub. She screamed and fell down. Nightmare Moon proceeded to beat Celestia around the castle. She beat her to a large hallway with stain glass windows and a large door with a small, horn sized hole in it. Nightmare Moon was still far away after the kick she launched to Celestia's chest. Celestia crawled up to the large door and tried to place what little bit of horn she had left in it. It didn't budge. She heard the clopping of hooves in the distance and had just about given up hope. Suddenly, she heard a snapping of fingers in her mind. Her body was encased in a bright light and her horn was restored. She opened the door confused. "This doesn't make any sense!"
'Make sense?! My dear Celestia, what fun is there in making sense?'
Her breath caught in her throat as she whispered into the empty corridor, "Discord?"
'You better hurry Tia. Your sister is closing in, hurry, use the elements. It is the only way to stop her.'
She pulled out the elements of harmony from the case. "Thank you Discord, know that I'm sorry and I love you." She thought she heard him whisper back, but it was too faint to understand. Nightmare Moon came back into the room, "We are done sister, it is time for you to... The Elements!"
Celestia rose to full height and channeled magic into her crown as the other elements of harmony floated around her. "I never wanted this upon you Luna, but for the good of my kingdom, you must be banished with no knowledge of what has happened this day, the day you changed into what you are. I'm sorry, truly. Goodbye my sister."
A ray of rainbow shot out and sent Nightmare Moon to the moon.
Celestia breathed a sigh of relief at how fast it was all over. She was quite glad for the full recovery. A guard came in at that moment. "Your highness, what happened here?" Celestia was cursing under her breath at the ignorance of the guards but said aloud,
"My sister has betrayed me. Let it be known She changed because nopony would ever appreciate her nights. So she became jealous, and that jealousy corrupted her to an evil entity known as Nightmare Moon. She was sent to the moon using the elements of harmony, but she will return in a thousand years."
It may take a very long time, but Queen Chrysalis vowed revenge on Celestia. It was supposed to be her love that powered her. but as it turns out, Celestia was just using her. Here she thought they actually had something between them. she was so very wrong. She was still weak and exhausted, both mentally and physically, after being betrayed but she had faith in the letter given to her by Nightmare Moon. She read the letter over what seemed to be the hundredth time as she made her way to the land of her forefathers and where her army resides.
The letter said
'Dear Queen Chrysalis,
'I have lost and Celestia has won, but fear not, I know she would never kill her own sister. We will get our revenge for her treachery. I believe infiltrating Canterlot with your army is the best way to get it. But you are far too weak and we both know it. Your army will not make it past the shield protecting Canterlot by the captain of the guards. You must weaken him by stealing the love he feels for his betrothed. Once the shield is weakened, and you have gained enough power, release your changelings upon all of Canterlot, and destroy Celestia. When she is defeated we will rule Equestria together.
Do not fail me Chrysalis!'