The ultimate evil

It was a sunny day in Ponyville, and the birds were chirping their spring songs. Everypony was enjoying the day, except for Princess Twilight.

She was in her new castle, still trying to catalog every book that had appeared with it. It had been a week since it first appeared, and she still hadn't gotten all of the books recorded. She was in the library, checking to see if any new books had appeared, because she had learned that new books appeared exactly where she would've put them, had she been the one to bring them. "I still don't understand why the new books just appear out of nowhere," she said to nopony in particular, as no one was with her. She was three hours into this attempt  when she heard a small pop behind her. She turned and saw a book lying on the floor.

It was a hard cover with a leathery appearance, and had dark highlights at the corners and a red circle in the center. It didn't appear to be that thick. Twilight walked over to it while thinking, Why did it appear on the floor? The others all appeared on their shelves, so why not this one. Once she had walked over to it, she picked it up in her magic and opened, and was surprised at what she saw.

This is a spell book! Shouldn't it be in the archives back in Canterlot. Just before she closed, she saw that one of the spell descriptions read, "This spell will bring peace to the world of whomever casts it, should they wish for it at any cost." Twilight almost instantly had a huge grin appear on her face. She couldn't believe that who ever wrote this book had a spell for world peace. Then she though, Then again, that might just be for a certain amount of time, the spell itself becoming less effective as the years went on and the caster eventually dying probably stops the spell then and there. She then went to look at what was required for it, and was surprised to see that it only required power, which she could easily generate, seeing as she was an alicorn. It didn't need any sort of incantation, which was a little surprising a the spells' intended result, but this only made Twilight want to cast the spell more.

She charged her horn, and did what the book instructed, which was to think of all of her favorite memories, the ones that had made her the pony she was today. I took a full minute before her magic was at the level needed for the spell. She unleashed the spell, with an orb of lavender light expanding outward from the tip of her horn, invisible to all but her, and grew to envelop her.

She didn't notice this, however, as her eyes were closed so she could more easily concentrate on the spell. The orb began to turn a dark shade of purple, and it began to seep into Twilight's body, this also going unnoticed.

When it was done, the entire orb had been absorbed into Twilight's body. She opened her eyes and saw that the book was still there. She grasped it in her magic again and went to put it on one of the shelves. Just before she placed it on the nearest shelf, she though to herself, This book may hold other spells that could help ponykind. She pulled the book back to her, In which case, I think I'll keep it.

She continued working on cataloging he new books, always making sure that the spell book never left her side.

That night

Twilight was asleep, the book she had found on her nightstand. Her dreams were livid. They had a crowd of ponies bowing down to somepony on a throne, but she couldn't see who they were bowing down to. She saw Equis thriving with unknown technologies, as well as her friends smiling. Then, she felt a pain in her head, and with it, many of her memories were seen in a new light. She saw her and her friends defeating Nightmare Moon, but instead of the happiness she normally felt with this, she now felt sorrow as she saw Nightmare being enveloped by the rainbow. She then remembered what she had read of Nightmare Moon before her return, and she was suddenly angry at her closest friend, Princess Celestia, for not doing anything to stop Luna's transformation.

Little did she know, the spell she had cast had begun to affect her memories, making her see important memories in an entirely different light. Those that were negative, such as Discord turning her friends against one another and Nightmare's return, were now positive, and vice versa. The ones that became extremes of what they already were included memories of arguments with her friends, and of them, Celestia, and her brother completely abandoning her at the wedding two years ago. Where these were ones tha twould normally make her feel ashamed or upset, they now made her angry at all of them.

As this was going on, a being that nopony knew the name of watched from the darkest corners of the multi-verse, smiling. The being was taller than a minotaur by a few good feet. His skin was ashen gray, his eyes, of which there were six, were ruby red ovals. Instead of hands, he had two pincers, with two fingers and a single, grasping claw that was reverse the direction of the others and went between them.

He was surprised that this plan, one of hundreds to take over the multi-verse, had started out this well, unlike the ones that took place in the same dimension as Lone Shadow, but that wasn't important. What was is that this dimension was already under his grasp. And he would make certain nothing would change that, and he then turned his sights to that of Princess Luna.