As Twilight helps Zecora collect Scari Berry, she comes in contact with some while falling off a cliff and received a gash to her eye. Now she keeps envisioning illusions of Slender Mane that she thinks are real, nopony understands what she is seeing and waves it off as insanity. Now she doesn't know who else to turn to. Can Twilight overcome her insanity?

Some experts think that Slender Mane is a type of sentient tree.
Some of Fluttershy's friends thought Fluttershy was a tree.
They are both half right.

Fluttershy's nineteenth birthday sets into motion a chain of events that makes her question who she really is. Meanwhile Slender Mane slowly closes in on her.

(based off of Tribe Twelve)

Speak no evil, only breathe. Hear no evil, only listen. See no evil, only darkness... or so the tale goes.
Twilight Sparkle retires an old tome to the shelves one final time, having more than enough spooks for one night. Now with Spike away at Applebloom's, she can relax, because after all, a story is just a story... right?

Read this in the dark.
Fanfic Reading
Artwork here.

Many adventurers have delved into the Everfree without taking the main route, and few return. Those who come back tell storys of vicious monsters, lethal plant life, or many came back purely from fear of the forest. However, one pony has came back with a most peculiar story. He tells of another pony in the forest, dressed in a formal black suit and tie. It, since it's next features describe it as such, has tendrils that extend indefinitely. It's face, if one calls it that, features no eyes or mouth, and does not possess the mane. In order to investigate this phenomenon, Clear Dawn and Maneshot decide to uncover the truth of this mysterious stallion, and his plans...

...

When Rainbow Dash won't answer Twilight's letters, Twilight goes to look for her friend, going on a scary adventure.

An encounter with a spiky haired, brown coated stallion brings in a dark creature from another world, leaving Twilight to figure out the mystery of the tall, suited pony.

It was a beautiful summer night in Equestria. Everypony was in bed and sleeping the night away. That is, except for one silly filly who decided to run off into the woods to play. As it got darker and darker, the filly saw another pony off in the distance. As he stared at the pony, he began to feel faint and heard a static noise. Figuring it was just his camera, he just shrugged it off and went closer and closer. The pony turned around to reveal no face. The next morning, the news network put a story about the filly, who has gone missing. Everypony thought he was just lost and would come home the next night. He didn't. Then, two more disappearances were reported on the news. Twilight decided to do some research and found a very old myth called the Slender Horse. A frightening creature that has no face, extremely long limbs, and tentacles coming out of his back. Twilight warned the entire kingdom about it. They all barricaded their doors. Praying that the night will pass and they can escape to another country. But will they survive? If you guys don't understand the lab reports, I will explain. After the Slender Horse case, Twilight and her friends have gone insane from Slender sickness. They are in a mental repair institution. The lab reports are the doctor's progress on the process of restoring the Mane 6's sanity, as well as their progress to finding out what happened though their eyes.

Edit: To clarify, Subject 46523 is Twilight, Subject 165 is Rainbow Dash, and Rarity is Subject 3614. I will update for the others if I include them.

Slendy, poor ol' Slendy. Stalking the Everfree Forest for 10,000 years can take a toll on both your memory and your spirit. But now, a favorite trio has decided to show up to make things a little more interesting. ART: Trinityinyang on DA- AMAZING WORK! Thanks! Editing: TechSavii- Great job, can't do it without you. Thanks for your help!

Carried over from EqD

Deep in the Everfree Forest, something has awakened. Something ancient. Something monstrous. Something hungry. What could this mysterious figure be who walks among the trees on legs far longer than any other pony? Where did it come from? And what does it want with Twilight Sparkle?