"You know I'm ready! I'm your most magical student and yet you still think I'm not ready?!" shouted the orange mare.
Sunset Shimmer was Princess Celestia's, the princess of the sun's, most 'faithful' and definitely most powerful student. Sunset was a powerful unicorn with a red mane with yellow streaks. Though she may seem... nice, she was always a bit impatient. Through all of her years of being the princess's protégé, she continued to amaze Celestia with her magical abilities. Sunset was beyond any unicorn her age and that is definitely most impressive, even to an immortal princess.
One day, Princess Celestia showed Sunset a mirror which opens up a portal to another world once every thirty moons. She didn't tell Sunset where the portal lead though. After showing her it, the princess decided to move on with Sunset's studies and only give her more info when she thought her student was finally ready.
Later after seeing it, Sunset decided to ask her teacher about said portal. Celestia put her down on that request and simply said she wasn't ready. She did the same the next day but Celestia only said the same words.
This went on for days and later weeks but one night, Sunset eventually had enough. She managed to find out when the portal was open and she planned to sneak through to see what lies beyond. Sunset stood in front of the mirror and just as she was about to step through, the door behind her burst open and came through two of the castle's royal guards and Princess Celestia. Sunset was told to step away from the portal and that she still wasn't ready to learn what's on the other side. That was Sunset's snapping point.
"You know I'm ready! I'm your most magical student and yet you still I'm not ready?!" shouted the orange mare.
"My dear student, you are a very powerful mare but you do not understand. What lies beyond that portal is beyond anything Equestria has ever seen. It is even beyond my knowledge," spoke Celestia in her soft princess tone. "It is simply too dangerous to send a helpless unicorn to adventure somewhere despite her knowing the dangers-"
"Helpless?!" Sunset interrupted her teacher. "I am able to handle the dangers you through at me! Whatever's on the other side of that portal couldn't be anywhere near as bad as what you've put me through and I will prove it!"
"Sunset, no!" Celestia leaped forward to try grab hold of her student. But she was too late. After Sunset ended her final words, she jumped through the portal. The royal guards could only stare in shock as they now watched their princess silently sobbing on the floor.
"Sunset... no..." whispered Celestia as she layed on the floor. "Not again..."
~Unknown world~
Sunset opened her eyes to see that she was laying on a cold concrete surface. She slowly picked herself up but suddenly tumbled back down onto the floor. She caught herself before face-planting once again but something wasn't right. Sunset stared at her... hooves?
"W- what happened to me?" Sunset asked herself. "What am I?!" Sunset stared at what used to be her front hooves but only looked away as she saw she was wearing clothes. She followed the sleeve until she saw how her entire body looked. She wore a purple shirt that had her cutie mark symbolised in the middle of it and a black leather jacket over the top of it. She wore an orange skirt with a yellow streak and a more similar colour to her shirt streak going from top to bottom. And she wore tall grey boots on her back... whatever those are that replaced her hooves.
She tried to pick herself up again, this time using support from the statue that stood behind her. She looked at her surroundings. It was clear that she wasn't in Canterlot anymore. Small buildings stood in a row leading up to a split path that went both left and right.
The building that was closest to her however looked nothing like the rest: It was much larger, it was shaped differently and it had, like, a hundred more windows. It wasn't as easy to see due to the building being made of darker bricks and it being nighttime but Sunset could make it out.
It was very quiet were she ended up, and really cold.
Sunset knew she wasn't going to learn anything about this place tonight. "Okay, sleep now. Adapt to weird world later," said the mare turned alien.
Sunset let go of the tall statue with a horse carved from the stone and got down on all fours. She galloped her way towards the large building's glass door and used her magic to open it. She tried to at least. Sunset put her right front hoof on her flreheaf, looking around for her horn. All she felt was cold bare skin.
"Where's my horn?!" shouted Sunset. "What is going on here?!"
First she's turned into some kind of flesh monster and now she's been stripped away of her magic! She was already beginning to regret her decision but she didn't think it was a good idea to go back to Equestria, not with how she left Celestia.
Since she couldn't open the door with her magic, she would just have to use her new front hooves. She tried to open it again but to her annoyance, it was locked.
"Great. Looks like I'm going to have to sleep outside," she said to herself.
She trotted back down the steps leading up to the locked front door and looked around the building. There were more doors but much like the first one. Locked. She passed a few bushes and despite how uncomfortable she'll be, it might save her from freezing to death. She ripped off a bunch of leaves from the sticks of the bushes, arranged them to cover her new body as much as possible and settled down for the night... on dirt... behind bushes... in the cold... Just as she closed her eyes, a cold wind blew past her, blowing off some of the leaves covering her.
Sunset opened her eyes and sighed, "This is going to be a LONG night." Sunset suddenly heard a noise coming from nearby. She curled herself up and tried to make as little noise as possible. She was right for the first time tonight. This will be a very long night for her.