The following events have never happened, this is just a story.
Twas the night before Nightmare Night, where most ponies are getting ready for scares and jitters. Applebloom, Scootaloo, and Sweetie Belle were heading to school for an after school Nightmare party. They were already wearing their Nightmare Night costumes, Applebloom was a pirate, Scootaloo was a zombie, and Sweetie Belle was a princess thanks to Rarity.
"Come on girls! We're goin' to miss the party!" Applebloom said behind her as she galloped to the school.
"What's the big rush Applebloom? We're already early." Scootaloo says galloping behind her.
"Cause! Miss Cheerile has a new scary story to tell for us! And I want to be there for the whole thing!"
"Hey! Can you wait up?! I can't run in this!" Sweetie Belle yells far behind them.
After a couple minutes of galloping, they reach the school. Outside the school stood Cheerile and a cloaked stranger, they were talking to one another.
"Howdy miss Cheerile! ....Who's this?" Applebloom said once she reached the school doors.
"Oh, hello Applebloom, Scootaloo, and Sweetie Belle! I was just talking with this kind gentlecolt, he actually wants to tell everypony about a legend of a Slender Stallion." Cheerile says.
"So, what's your name anyways?" Scootaloo says questionably.
".....That is none of your importance....." said the stranger, his voice seemed hollow and without a spirit.
"Ok...." Sccotaloo says while scooting back.
"Well lets go inside, seems that the others are coming." Cheerile says looking away from the school.
They all went inside, including the stranger. After a few minutes of waiting, everyone from Cheerile's class entered the school and sat down talking. Cheerile hushed the students and drew their attention to the stranger, you can't see his face even if you're up close.
The stranger then began to speak "......I will tell you of a legend of a Slender Stallion, be warned by what I tell you......it may just save your life....."
".....There lives a Stallion that dresses in darkest suit and tie, he.....is very very tall and has tentacles coming from his back....but other than his height and tentacles that make this stallion different.....is his blank face. No eyes, no nose, no mouth, his entire face is blank and white. He follows.....unsuspecting victims, as he blends within the trees of the Everfree......he slowly drives ponies insane with just his appearance......and when you think he's there, he's not, and when you see him, he will see you......He follows others even outside the forest, slowly but surly pulling them back into the forest.....and kills them leaving nothing but their corpse sprawled across the ground.....and a symbol that he was there.....He lives deep within the Everfree and only comes out on the darkest of nights.....
So if you should see this figure in the Everfree.....just pray.....that you.....will live.....and escape...."
The stranger then collapses onto the floor, his cloak seemed to hit the floor with nothing underneath. Cheerile grabs the cloak to find that there was nothing under it, as if the stranger disappeared. The others were shivering from the tale, all expect for Applebloom and Scootaloo.
"Come on...I've heard scarier before!" Scootaloo says.
"Y-Yeah? Well what about him just vanishing like t-that?" Sweetie Belle says.
"He might've been a unicorn and disappeared without his cloak to scare us"
The others started to calm down and laugh a little, suddenly Applebloom sprang up
"I got an Idea! Come on Cutie Mark Crusaders! Let's go to the clubhouse!" she then dashed out of the school
Scootaloo and Sweetie Belle did the same and followed her. When they got to the clubhouse Applebloom was already making a plan.
"Applebloom! What was that all about?"
Applebloom hung up a poster and said "Cause we're going to catch that Slender guy! We can be 'Slender Catchers'!"
Scootaloo then said "Alright! Let's do it tomorrow when it gets dark!"
"Now wait a minute! What if the legend is true? What if he comes for us?! What if h-" Sweetie Belle tried to say but was hushed up by Scootaloo.
"You worry too much Sweetie Belle! We need to just look for him, If we don't find him big whoop. We can just try again!" Applebloom says with a cheery voice
"Yeah! Come on! let's think of a way to trap him. Remember he has those tentacle things on his back.." Scootaloo says
"And he's REALLY tall! Don't forget that!" Sweetie Belle says
"OH, OH I know! How about we-"
As the Cutie Mark Crusaders discuss their plan, in the Everfree not far from where they were, the Slender Stallion watches from a crack in a tree. He then disappears into the forest, leaving nothing behind.
After everything was explained Applebloom, Scootaloo, and Sweetie Belle went back home. When Applebloom got home Applejack was waiting for her at the front gate.
"Applebloom! Where were you?" Applejack says with a mad tone.
"I was with the others planning on tomorrows crusade!"
"Well it's time to get to bed. You don't want to miss tomorrow now do ya?"
"No..." Applebloom went inside Sweet Apple Acres and inside the house, then she went upstairs to her bedroom.
She looked out the window and saw a tall figure standing at the gate, she rubbed her eyes and looked again. The figure wasn't there anymore.
"Boy....I must be more tired than I thought!"
She then climbed into bed and fell asleep. In her dreams, she had tried to picture herself and the others capturing the Slender Stallion and getting their Cutiemarks. But to every dream there is a nightmare, and this dream turned into one terrible nightmare. Applebloom was alone without her friends, the Slender Stallion was right infront of her. It opened it's seemingly invisible mouth and chomped down on Applebloom which caused her to wake up with a scream.
She looked around and sighed with relief as it was just a nightmare and fell back to sleep.