Who cares about the past?

Twilight walked through the large door into a dark, long corridor. The faint sound of trickling water sounded in the distance. She gulped, and took a step. At that moment, a sound of a rock hitting the floor echoed through. Twilight gasped and held her breath. She waited about five seconds until exhaling deeply. She closed her eyes and took two more steps. Quiet. Turing on the lantern, she followed the circle of light in front of her. Dirty windows were aligned along the corridor, casting small pools of dim moonlight on the carpeted floor. A sickening noise that sounded like giant spiders crawling sent shiver's up Twilight's spine. A staticky buzzing noise filled her ears. It came from her saddlebag. She turned and levitated a black rectangle out of a pocket.
"Hmmm...I didn't see that! What is this...? I think it's a radio..." She muttered to herself as she observed the object. It sounded like a village of wasps were living inside of it. She tapped it with her hoof and the buzzing stopped. A mare's voice came from the radio, it sounded like Pinkie Pie.
"Hello...if you're Twilight Sparkle, you are in terrible danger. I hunt know if you remember me...this is Pinkemena Diane Pie...d...d...DELETE! Sorry...listen, you have to get out of here! Rainbow Dash...she...ACK!!! D...delete!! ERRORRRrrrr!!! D...d...error...delete...killed....Applejack!! They're all dead! Reach the green door at the end of the castle....you'll be safe there...Rainbow....RAINBOW DASH!! NOOOO-"
Twilight stared at the recorder with wide eyes. What happened to Pinkie? What did Rainbow Dash do? Hear heart began to beat faster than ever, and she dropped the recorder to the floor, gasping for breath. The recorder smashed into two pieces. Twilight had never been so terrified in her life. Her friends...they were all gone. She bent down to examine the pieces until she realized that something fell out. It was a wadded up paper, it looked like it had been there for years. Twilight picked it up and flattened it out, and read the words.
"Self defense for the average unicorn, level one.Sometimes, a unicorn (when handling a lot of stress) can experience a nightmare unlike any other. He or she will think that it is real, but they are either in a comatose or a power sleep. The dream can last up to three days, maybe more. A unicorn may bring a Pegasus with him or her if there is physical contact between the ponies. To escape this nightmare, the unicorn (mature or foal) must complete a number of puzzles throughout the world. There is a spell to get out, but it is only for the highest level unicorns. The only unicorns in pony kind to achieve this spell are Starswirl the Bearded, and the others who were successful did not live to tell the tale.

She was only in a nightmare? But it all seemed so real! She had to try the spell. She had to get out.Twilight read the instructions to do the spell put loud, and one of the steps was "think a happy thought or memory". What about the time when...Rainbow Dash saved Rarity from plummeting to her doom? No...no...the time where she became Princess Celestia's private student! Or...when she defeated King Sombra to save the Crystal Empire? She bent her head and concentrated. Beads of sweat poured down her face as her horn began to spark. Twilight grit her teeth and struggled harder than she ever had in her life. Suddenly, she disappeared in a ball of sparks and light.
Once again, she was on the floor. She was...in the school house? In Ponyville! Everything seemed bright and cheerful. Twilight stepped out of the school to go see her friends, but what she did see almost made her want to vomit. She was back in the castle. Except this time, it was completely lit up, so that she could see everything. Dried up corpses of ponies hung from the walls. A picture of a heart was drawn in blood on the carpet in front of her. Under the heart, spelt the words "I sE3 y0u." Twilight pulled out her lantern again, surrounding it in a magenta glow to make sure it didn't fall. The spell didn't work at all! She had just used a teleporting spell.
"God dammit!" She whispered to herself. Twilight wanted to go back into the school house, where it was bright. She galloped to the room and shut the door behind her. She turned off the lantern and stuffed it into her bag. She was going to live here if she had to. Everything seemed normal Cheerilee's desk had the same amount of cards and apples from her students, the desks were all aligned properly, (Scootaloo's being the one with paper sticking out everywhere) and there was even the black board, which she expected to have scratches or blood on it. Everything seemed normal. Twilight walked over to Scootaloo's desk, smiling of the memories of the orange filly. Suddenly, something caught her eye. It was a certain piece of paper sticking out from the desk.
"Look...in...the...desks." Read Twilight. She wondered if it was a message from the real Scootaloo. She opened up the first desk, to find another bottle of pepto bismol. She stuffed that into her bag and went to the next one. Inside that was more oil, so she took that. But inside the next one was a peculiar shape...a pony! It was Sweetie Belle! The white filly's chest rose and fell. She was alive!
"Sweetie belle...sweetie! Hey!" Twilight shook her awake. The unicorn stirred and looked up at her.
"Twilight...? What happened?" She asked. Yikes, her voice sounded awful. Sweetie belle must have been miserable. Twilight stroked her mane to calm her down.
"Where are Apple Bloom and Scootaloo? Why am I in a school desk?"
"Ssh. We'll find them. You are in a dream, but I'll protect you. Tell me, were you and your friends having a sleepover?"
"Yeah. I only remember us being all snuggled up before we went to sleep."
"Okay. That was all I needed to know."

But at that moment, Twilight realized how much her friends must be trying to wake her up. She choked back tears and whispered, "I'll be back soon."