An Old Whooves Tale.

The Doctor continued to run with Derpy chasing right on his heels. “Derpy you need to snap out of it!” he cried behind him, but Derpy gave no answer. He continued sprinting down the hallway until he could see the TARDIS in the distance. The Doctor exited the castle and quickly put the key in TARDIS and opened it. He looked back and Derpy was still flying, trying to beat the Doctor from closing the door.

“I apologize for this in advance Derpy,” the Doctor said to himself, and just before she made it through the threshold, the Doctor flung the door closed and he heard a loud crash on the other side.  The Doctor opened the door and Derpy was knocked unconscious against the TARDIS door. He grabbed her quickly and brought her inside.

Meanwhile the dark matter creature started to invade Princess Luna’s mind and take control of her. Luna was surrounded by darkness, never ending in all directions.

“You know how to put up a fight Princess. This is more difficult than I thought!” Luna desperately tried to fight off the creature in her mind, but it knew every little doubt and weakness that it could get it’s little grubby claws on. She tried to think of all the good things in her life and how happy she was, but still the creature flooded her mind with selfish thoughts and her worst fears.

“Come one Princess it’ll just be like filling in the spaces of your mind with sand,” the creature whispered.

Then from the black, Luna saw Celestia in the distance. Luna tried but couldn’t move and Celestia laugh at her as the room began to get extremely hot. Suddenly she realized that she was in a cage heading straight for the sun and her sister stood by watching her. In the real world Luna let out screams of pain and anguishes as the creature continued its assault on the Princess’ mind.

The Doctor laid Derpy down and hooked up his sonic screwdriver to the TARDSIS.

“Okay, the TARDIS should have enough power to drain you of all that bad dark matter energy, hopefully.” The Doctor scanned Derpy’s body over and over again, then he ran over and pulled a lever. There was a loud crack in the TARDIS and the whole thing gave a giant shake, sparks were flying and the core glowed furiously.

“Come on baby you can do it! I know it’s difficult, but I believe in you!”

Derpy began to shiver on the floor and scream in agony.

“PLEASE JUST NOT DERPY!” the Doctor closed his eyes and he held onto his sonic screwdriver with his life. He was afraid removing the dark matter might destroy Derpy’s mind in the process, if it wasn’t exact. The TARDIS finally calmed down and the Doctor ran over to Derpy. He scanned her with the screwdriver and studied the results. The Doctor gave out a sigh of relief and began trying to wake up Derpy.

The Princess was beginning to loose her battle as the dark energy was polluting her mind faster than she could fend it off. Luna still saw herself in a cage hurtling toward the sun, it was growing hotter by the second and Luna was convinced that she was going to be burned alive. In the distance she heard a voice, “We can get you out.” Luna tried to block out the sound, but somehow it still leaked right into her head.

“We can stop the suffering. We can get rid of the sun for good.”

“No, get out of my head!” Luna cried out, but her cage only got hotter and her sister’s laughter in the distance grew louder.

“Derpy, Derpy please I know I gave you a good knock on the noggin, but I need you awake for a moment.” Finally after patting her face for a minute Derpy finally came to. Her vision was blurry and she could hardly form words. Her eyes returned to their natural cross-eyed state and the world was coming into focus.

“Doctor?” she muttered.

“Thank god you’re awake, Derpy I need you to tell me something. Do you remember the night that you and I first met and you mentioned an old mares tale?”

“I-uh… I’m not sure I think so?”

“Please focus, you mentioned an old legend that took place a thousand years ago your time. What was it?”

“It was uh- it was about the two sisters who rose the moon and the sun, and one day one of the sisters refused to bring down the moon.” The Doctor helped Derpy to her hooves.

“Did it mention why?”

“Just that one sister was jealous of the other, then she was banished to the moon, and that’s why they call her Nightmare Moon.” Derpy rubbed her head as a massive headache was pounding her head.

“Oh no.” the Doctor said as he ran outside and looked up at the castle.

“Let the night take over Luna, you can ease your pain if you trust us.” The voices in Luna’s head repeated.

“No, I must- stay strong.” She replied weakened from the heat. The cage was near the surface of the sun melting around her and Luna was almost certain that she was going to die. Then she heard Celestia’s voice from the distance.

“Oh foolish little sister, don’t you see? Nopony wants the night at all. They all crave my daytime and you’re little rock in space is nothing compared to my giant star! Long live the daylight!” As Celestia said this she raised her hooves in the air and everything around Luna became surrounded in blinding white light. This was it Luna thought. This is how she would parish, in her own sister’s sunlight. Then somewhere in her mind a switch clicked and Luna stood up.

“NO!” Princess Luna yelled out, and the heat was instantly dissipated along with the cage around her. She was consumed by darkness

“Doctor why is the legend so important what’s happening?” Derpy raced outside and looked up at the clouds that were now circling the castle ominously.

“Because Ms. Hooves, I believe I’ve just created Nightmare Moon.”