Creepypony

Star Wishes immediately was overwhelmed by all that was going on. She thought there would be almost nopony there, but there were hundreds, maybe thousands working together, much like a beehive. There were mares and stallions alike, all dressed in white lab coats or in protective armor carrying some sort of gun on their back. Nopony stood still for long.

A stallion noticed they had come in and greeted them, identifying himself as Apple Cinnamon, one of Applejack's cousins. After pleasantries were made, he invited the mares to the grand tour. They both agreed.

The trio came to a metal door, which opened mechanically for them. Apple Cinnamon began talking about the history of the place, but after the 80th Celebration of the Sun, Star Wishes lost track and looked around the room they were in. Hundreds of doors spread down the hallway, some with labels ripped off or concealed with duct tape. Most read, 'Files of Unmentionable number ___' or, 'Key to Operation L'. All of which made no sense to Star, but she didn't ask about it.

Apple stopped at a door marked 'Not-so-urban Legends' and entered. The sisters followed suit.

Cages of all sizes and variety were lined up against the walls. Only three were occupied.

Seeing he had started saying important things, Star finally qued in on what Apple Cinnamon had to say. "This one here is called the Rake. He likes to watch you sleep at night. He's so cute right? Heh. Try thinking him cute after he bores of you sleeping and either drives you insane or he kills you. He is incredibly fast, so the only way we keep him locked up is vibrating his cage here so he just loses his footing. We just found him at the edge of the Everfree Forest before he entered Fluttershy's abandoned home, which was under investigation for fumes. I don't really know why, so let's move on, shall we?" Apple walked over to another cage and waited.

The two mares looked at the 'Rake'. He had big, black eyes that shined in the light. He also looked like a filly, but his legs were too long. So long, in fact, that they just looked awkward on his small, bony body. He looked at Star in such a way that it sent shivers down her spine. Finally the mares had had enough of him and moved on.

"Scared yet? Didn't think you were. So, here's one fer ya. This here is Mr. Slendermane. Now this was one of the most dangerous and hardest to catch in this facility. He likes to take fillies, young mares and stallions, hunt them down, then devour their souls. Since we didn't have the technology back then, we trapped him in a game where you have to find notes or he kills you and eats your soul. You could play infinitely and he wouldn't really eat your soul, only on the game. It was fine until other gamemakers saw the success of the game and made others pretty much like it. They made him more and more powerful until he could've escaped from the game at any point. But he never did, thank Celestia. Then just last winter, we had the tech, so we trapped him here, where he has been ever since. One of our head engineers found out how to trap him: King Sombra's dark magik. See, Slendermane only eats the souls of the innocent, and rejects all that have sinned. Thus, we multiplied Sombra's magik by a hundred then applied it to this cage. He hasn't escaped yet, but we are still adding modifications to his cage." Once again, Apple Cinnamon trotted over to the last cage and waited for the two mares.

Star Wishes looked at the Slendermane, but Sunny bailed and went over to Apple and started chatting with him.

Through Star's observations, Slendermane had a black tuxedo, white undershirt, red tie, and no shoes or hoof guards. His build was that of an alicorn, only without the godly horn and wings. He also had the strangest of cutie marks: a bloody circle with a big X over top of it. Slendermane looked at Star and her vision began to fog and go fuzzy. She looked away and ran to the other ponies.

"Hey there, Miss Star Wishes! I just had the most wonderful of conversations with yer sister. Ready to begin? Okay. This monstrosity is what locals call the Mothmare. Nopony knows much about her but her appearance and her stalking abilities. Her red, buglike eyes help her like nightvision goggles and heat detectors combined. Her leathery wings help keep her flying swift and silent. She was found in the Neighgara Falls area, where it is pretty cold, thus the furry body." Apple Cinnamon moves over to a pair of doors, one marked 'Insanity' the other marked 'Disease'. Over top of both of these was a sign that stated, "Ponies".

A shiver ran down Star's back. The Elements would be behind one of these doors, along with... Star shook her head to clear the memories from clouding her judgement. She couldn't afford to think like that, not now. She was on a mission from Princess Celestia that she must do.

Star swallowed and followed the happily chatting pair into the door just as the lights began to flicker. Faster and faster they went until a backstage room of the Ponyville theatre was seen. A shadowed pony walked slowly to the middle of the stage, dragging a cello. The figure stopped in center stage and began to play a sad and haunting song. The lights flared on, revealing Octavia herself playing, her eyes  bleeding darkness and small, red pupils. She cried tears of blood as she played. Soon her skin began to flay off into perfect squares, almost as if it was cut by a knife.

A single pony sat in the audience, grinning maliciously. Her white head bobbed to the melody of the music while she sipped her drink. She had a console of sorts on her lap, on which she pressed a button. Octavia began to play faster to a new song, an old and very powerful tune. As the mare played, reality began to unravel. Paint and wallpaper stripped off the ceiling and walls, the carpet burst into a million strands of yarn, and the seats, save the one the white pony was on, all lit afire and burned while Octavia played.

The theatre itself disappeared, leaving the two ponies in a dark abyss known as the time between sleep and consciousness. Still Octavia played. Her hooves were moving so much, her bones began to wither away, until all that was left of her was a single cello, still playing by itself. It had begun playing the haunting melody from before, from the command of the mysterious white pony.

The mare stood and began to walk. A portal appeared before her, in which she entered, leaving the cello behind.