Prologue- The Rise of Chaos
What used to be Equestria was now a chaotic mess. Animals had turned insane and rabid; buildings had been turned upside down. It was raining, snowing and sunny all at the same time. Everypony seemed to be helpless, hopeless, nothing could be done.
Celestia gazed out of the window, watching the chaos unfold before her eyes. If only she could do something, anything so long as the pony she loved was unharmed. Letting out an exasperated sigh and burying her heartache away, Celestia turned and walked away from the large window. Her heart felt cold and betrayed as she glanced over her shoulder at the wings he gave her, thinking about the eternal life that now cursed her. If only she had seen the signs of his ever growing chaos and insanity, maybe she could have stopped it.
****
The room around her was dark and cold as a sense of unease crept into her mind.
What's going on? Celestia thought as she tried to keep calm and compose herself.
Maybe this was just a joke Mundus was playing on her, which was the only explanation for his strange actions. She was called out for a "talk", something Mundus wasn't exactly famous for and tended to avoid. He was a partying type of pony, talking wasn't exactly his forte, although he adored riddles.
Suddenly, the lights turned on and Celestia found herself staring into Mundus' dark blue eyes. She yelped, jumping back, before realising that it was just another silly prank, as per usual.
"Hello, my love!" he greeted, his voice loud and exaggerated, his customary goofy smile on his face. "Sorry for the scare, I wanted to surprise you!"
Celestia glanced at the bronze unicorn with curiosity. "Ah, no, it's fine, I'm well used to your ridiculous pranks by now... Did you need me?"
Mundus laughed and Celestia recoiled back slightly. This laugh was different, although it had his usual warm, cheerful tone, it was bordering on insanity. Of course, Celestia brushed it off. He was fine, he was always fine. He had to be fine, Mundus was the ruler of Equestria, and he had to keep all of their land under control.
"I will always need you dear, always! That is why I'm giving you a gift, so close your eyes," he smiled encouragingly at Celestia, until she finally obeyed.
Warmth filled Celestia's chest, and her hooves were lifted off the ground. A bright light surrounded her, and Mundus grinned as he watched the light engulf his lover.
Suddenly, a searing pain jolted through Celestia's body and she cried out in pain. She tried to talk, tried to ask what was happening to her but she couldn't find the energy to speak. It hurt, it hurt so much.
Finally, the magic stopped and Celestia fell to the floor. Something felt different, she felt different. She glanced at her back to find that she had a pair of wings folded at her sides. Mundus had changed her into an Alicorn?! It was impossible, only heard of in tall tales and hearsay. Something like this required powerful dark magic.
She looked up at her lover with tears in her eyes. How could he do such a thing?
"Don't you like it?" Mundus asked with confusion in his voice. "Now we can live together, forever!"
Celestia flinched, she had been cursed with eternal life. "But you can't live forever, you're just a unicorn."
Mundus smirked, his horn glowed a dark blue as he surrounded himself with his own magic. A light flashed before Celestia, and she cried out in shock. Mundus screamed in agony before the light went out and Mundus lay on the floor, with a completely different form.
Celestia glanced over Mundus' still form as she took in every part of him. His lion claw, his dragon tail, his bat wing. His body looked as if somepony had sewn many different creatures together, a conglomeration… no, a monstrosity.
"He turned himself into a Dragonequus," Celestia whispered, her voice shook with fear.
Mundus' eyes shot open and Celestia jumped back in fear. His eyes had changed colour, and were now a blood red. He stood up and smiled as he towered over Celestia.
"We can live together, forever, darling," he whispered, his voice dark and menacing.
Tears filled Celestia's eyes. "But what about Luna? I don't want this!"
Mundus smiled a sinister smile which flashed deep in his blood red eyes. "Don't worry, my dear, I had thought about that already. I made her just like you so you could keep your little sister forever."
Celestia looked at Mundus as she began to sob uncontrollably. "Please, Mundus, don't do this, you're better than this!"
As she reached out a hoof to touch him, he knocked her away. "No, that is not my name. I am Discord! The element of Chaos, Equestria will be full of beautiful chaos!"
****
Celestia sighed as she went out into the hallway to find her sister. She had to find a way to stop Mund- Discord, no matter what the cost was. Still, she couldn't help but feel her heart clench as she thought about hurting him, the pony whom she loved so much.
Celestia furiously shook her head. "No, he is no longer the Mundus which I know and love. He has changed something dark has taken over his heart. I cannot let this go on, I have to keep Equestria safe."
A flash of midnight blue caught Celestia's attention, causing her to turn and find her younger sister, standing by the window.
"Luna," Celestia breathed, "What are we going to do with this mess?"
Luna glanced out the window and shook her head with sadness in her eyes. "I don't know, I don't know a way to stop him."
"I do, but I'm not sure if I want to do it..." she said weakly. "I don't know what the side-effects would be, it could kill him for all I know."
Luna looked at her sister; her head tilted slightly, silently questioning her.
"The Tree of Harmony," Celestia said, simply. "We could take the elements and use them against Mun- I mean, Discord."
"Are you sure you want to do this?" Luna whispered. "Does the tree even exist?"
Celestia looked away, out into the chaos. "It does, I found it years ago. It hides deep within the Everfree forest."
"But, do you really want to risk killing Mundus?"
Celestia flinched at Luna's question, of course she didn't, but there was no other way. It had to be done. "Once this is over, we're going to have to take control of Equestria and keep it safe. We need to make sacrifices, sister. This must be done, for the safety of everypony living here."
Luna nodded and Celestia turned, leaving the room. Tears trailed down Celestia's cheeks as she thought about what she is going to do. Could she really do it? Could she really use her magic against the pony she loved?
As she was leaving the room, she called back to Luna, "Pack a bag; we'll be leaving in a few hours."
She knew deep down, that although she loved Mundus, she didn't love Discord and this had to be done; for the sake of Equestria.