Split Personality

by Lady_Facepalm

Rating: teen
Tags: Other, Crossover, Twilight Sparkle, Main 6, My Little Pony: Friendship is Magic, Dark, Doctor Whooves
Length: 2178

Thx to all the ppl so for who have liked this story! if i got it featured I'd be so happy! Twilight got the rare alicornian disese. It makes her have 2 different personalities and looks. How will she get cured?

Twilight has been diagnosed with multiple-personality-disorder, but they do not realize how deep it goes.In the day-time, she is normal but when she's out at night Twilight becomes an entirely different pony, and that is what everyone worries about. The pony she becomes calls herself Nightfall, a wicked dark hearted and furred pony, but not only does her looks and thoughts change, so do her memories. As Nightfall she had no memory of her great friends or family, only knowing that soon she will rule all of Equestria. Will the rest of the mane 6 find a way to cure her? Or do they even KNOW about what Twilight has?

Name goes to DragonLover553 because they came up with the name for evil Twilight.

Published 2013-06-15 02:00:02 UTC
Last updated 2013-09-01 20:52:12 UTC

Prologue: Diagnosis

"It was horrifying Doctor Whooves! I've never EVER seen that happen to Twilight before!" Spike told him after they were both safely outside of Twilight's hospital room."She fell on the floor while reading and just changed!" Spike was pacing back and forth across the hallway, so nervous and shaken up that the Doctor had to help him first.

"OK Spike calm down. Spike? Spike. Spike! SPIKE!!!!" The Doctor yelled. Spike froze and looked at him."What exactly DID happen to Twilight? She looks perfectly normal to me right now." The Doctor said.

"That's because she stopped being Her!" Spike told him with a shudder.

"Her? Who was Twilight other than herself?" The Doctor asked Spike. He was getting more and more confused as the conversation continued. I mean it was pretty far fetched that anypony could possibly be anyone other than themselves. Well unless it was a rare sort of sickness. But what were the chances of that?

"She was different Doctor! She called herself Night something . . . oh she called herself Nightfall Doctor! She sounded differently and wore armor and her wings were long and a dark purple."Spike told the Doctor.

"Her voice sounded funny and she looked different? Oh come on Spike I do not see any physical or mental differences at all!" The Doctor said to Spike. "Remember that I'm a Doctor and not a magician. Twilight looks and seems fine right now! I think you have been working too hard lately Spike. Do you feel like you are sick in anyway?" The Doctor asked Spike. Spike wasn't listening to him anymore. He just pointed at the crack under the door.

"Look Doctor! I told you! Twilight turns into something whenever she gets really frustrated or mad!" Spike said as he pointed at the door. Through the opening under the door, something that looked suspiciously like black smoke was leaking through.He then ran towards a towel rack and took refuge there.

Slowly, the Doctor opened the door to Twilight's room only to find himself face-to-face with a extremely scary scene before his eyes.

In the room stood a tall, thin alicorn with very dark purple fur in front of him. The mare appeared to have a dark purple and starry black mane and tail that moved in long, smooth waves like it had its own personal wind. Her horn was a curved, pure black talon shaped horn.What was more, was that the mare's wings unfurled themselves and the Doctor saw the dark purple and black feathers quiver. And the mare's cutie mark. . . the mare's cutie mark was just like Twilight's.

Even scarier was what she was wearing. Silver and black studded armor was laid out in intricate patterns all over her chest and back area. She wore dark, crown-like armor on the head that was, again, laid out in specific and intricate patterns just like the armor on her chest and back were. It also appeared to be made of the same kind of that blackish-silver metal that made up her chest. On her hooves, there were what appeared to be metal shoes that, also, had intricate patterns and shapes along them. As she turned to face the Doctor, he noticed that her eyes were a piercing bright purple with cat-like slits.

The Doctor stared at the strange mare with wide open eyes, not believing what he was seeing. He just couldn't believe what had happened to the once kind Twilight. Then the alicorn turned her attention to the Doctor.

"I am Nightfall! Newly born Princess of Darkness! Bow down before me subjects, or face my wrath!" Nightfall boomed to the frozen Doctor. Her voice was deep and resonated through the small room. The Doctor just stared at the mare."I said BOW!" She boomed again before forcing the Doctor to bow. But that small amount of magic was all that was needed to make the transformation go back."Ahh!" Nightfall screamed as she began to become normal once again. The mare's mane and tail went from the smokey, purple black starry mane to a strait, lighter purple with a few streaks. The mare began to shrink until she was about the size of the Doctor and her horn went from the curved, pure black horn to a smaller light purplish lavender. Nightmare, as she called herself, was turning into Twilight. Her wings grew smaller in size and grew lighter in color until they were normal again. The alicorn Twilight opened her eyes just slightly enough to see that the once bright purple cat-like eyes were replaced by a deeper color. Even though he was afraid, the Doctor gently picked up the sleeping unicorn and laid her on the hospital bed before going to speak with Spike.

"I told you!" Spike told the Doctor for the twentieth time."Doctor do you know what she has?" He asked worriedly.

"Yes I believe I do know," the Doctor began."I believe she has a very rare case of multi-personality-disorder Spike. It is very rare because only alicorns can get it. Along with that fact, it only comes out to infect one once every 1000 years. If ANYONE found out what Twilight has, they will be terrified of her! Do not tell anyone what Twilight has, because they may not understand and become so scared of her that she would be forced to take refuge in many places." The Doctor informed Spike.

"OK Doctor can we come back soon to check on her?" Spike asked.

"Yes come back in a week. When Twilight wakes up we must tell her. If she did not know what was happening to her it would scare her as well." The Doctor informed Spike. Spike nodded and went into Twilight's room and sat down, getting ready to tell her the bad news.

Author's Note

Ohhh what happened to Twilight??? (Makes evil vampire face)

Secrets

It had only been a week after Spike had told Twilight about what was happening to her, and things weren't going so well. Living with the knowledge that you had something nopony else would ever dream of getting was really harsh on Twilight, making most of her moods dark and sad when she was alone. On top of that she couldn't tell her friends about what she had. Doctor's orders.

"Don't tell anyone about what you have Twilight," he had told her. "They may become scared avoid you if you tell them." Then he told Twilight the most likely things that caused her to become Nightmare. "You probably become Nightmare when exposed to the moon for a brief period of time, extreme stress, and temper are the most likely causes. Stay mellow and away from the moon until further notice okay?" he asked her.

"OK Doctor. I know you know best." Twilight had told him. Twilight shook the thought from her head and kept preparing the library for her sleepover. She had promised her friends that they would have one, but what if they found out? Again Twilight tried to shake the thought from her head. Where they were coming from, she wanted them gone."Why don't they go away?" Twilight thought to herself as she made her bed and got some snacks out. All she wanted was to be with her friends and have a good time, but she just HAD to get sick didn't she?

"Whew," Twilight said aloud. Since Spike had to be in Canterlot she was doing a lot more chores around the library, and she was really tired.With everything set up, Twilight decided to continue working on a special drawing. She used her magic to open a small, hidden door and walked down. Inside the small room were many pictures of the other side of Twilight. She had asked Spike exactly what Nightmare had looked like and drew like there was no tomorrow, because Twilight had to know what she looked like as her other self. She just had no know.

Twilight sat down at a wooden desk and continued her most detailed drawing yet. The mare's mane looked like it was made of a dark, black, wispy fog. Her dark purple fur was darker in the area's covered by the mare's foggy mane and tail. Twilight was close to being done, carefully using her magic to draw the large, bright purple cat-li-.

"TWILIGHT!" Yelled some voices that surprised Twilight so much she broke her last quill.

"Drat!" Twilight mumbled to herself. Slowly she got to her feet and trotted up the stairs and closed the door. Well almost. She accidentally left a little bit open."Hey girls!" Twilight said as she let them inside.

"Oh hi Twilight," Fluttershy said."I hope were not bothering you in the middle of something but its time for our sleepover."

"Don't worry girls cause I have finished the arrangements!" Twilight said as she led them through the house to where everything was set up.

"Wow!" All the girls said when they saw the large spread of food and games.

"Well what are we waiting for? Let's get this party started!" Rainbow Dash yelled. All the girls cheered and began playing games and eating the delicious food Twilight had set out.

After about 4 hours of eating and playing, all the girls were very tired. "Ohhhhh........" Rainbow Dash moaned."I ate too much food...." And then she promptly passed out on a nearby blanket. The rest of the girls giggled and yawed.

"I think we should all follow Rainbow Dash's example and go to sleep" Twilight said to her friends. Soon they were all in a comfortable position to sleep in and they all fell asleep. Then Rainbow Dash woke up.

Now being an awesome mare like herself, she was always the fist pony to get up, which in this case, set her up to finding out the truth about Twilight."Maybe I should go back to sleep," Rainbow thought when she first saw the rest of her friends fast asleep. But of course she wanted to look around the library and try to find some Daring Do books to read and put her to sleep. As she looked through the shelves, Rainbow noticed the opening in the wall that led down to Twilight's secret art room."I don't remember that being there." Rainbow Dash thought to herself as the quietly walked closer to the strange opening. She then used her hooves to poke the opening in the wall, to see how far the opening went, when it moved.

"It's like a door!" Rainbow realized as she moved the bookshelf/door back and forth slowly. "Wait, why would Twi need a secret door?" The pegasus gasped quietly. "She must be hiding something from us!" Quietly opening the bookshelf, the cyan pegasus tiptoed down the worn wooden stairs and into Twilight's secret room. On the last step, all f the candles burst into flames and lit the room with a light glow so that Rainbow Dash could take in her surroundings.

The first thing she noticed, were all of the pictures, sketches, and notes taped and tacked on the walls. Rainbow ash trotted over to a page hanging on the wall that looked like it had been freshly written on.

Triggers For Transformation Are The Following:

Moonlight

Extreme anger

Stress

Possibility For A Cure To Be Found?

12.55% Likely.

The pegasus frowned and read the lines on the page again. Transformation? Cure? "What is going on with Twilight?!" Rainbow thought to herself as she studied the room some more, finally noticing a wooden desk tucked away into a corner of the room. It had one piece of paper on its' surface. Rainbow Dash carefully walked over to the desk and looked at the page, almost gasping at what she saw.

It was an amazing picture of an alicorn, but it looked suspiciously . . . evil. She noticed the dark purple fur, cat-like eyes, armor, and it's large wings, but one thing stuck out like a thorn. It was the cutie mark. Twilight's cutie mark.

The Evil Aspect Of Myself During The Alicornian Transformation:

Rainbow Dash froze. "What?"

The EVIL Aspect Of MYSELF During The Alicornian TRANSFORMATION:

The pegasus backed away from the picture. "Twilight's not evil!" She thought to herself. But then suspicion crept in as she glanced around the room. "Is she?" Quickly, Rainbow Dash grabbed the picture and the small page of notes off the wall and dashed back up the stairs to close the bookshelf door. She glanced down at the pages she held in her mouth. "I'm showing the girls this in the morning," she thought before tucking away the secrets in her saddle bag and laying back down.

"If that's not Twilight . . . I'm going to beat it up so much that it'll be sorry it ever even met me!" And with that final thought, the rainbow maned pony fell into a comfortable slumber once more.

Author's Note

I. Freaking. SUCK at deadlines! Sorry but I just had to say it cause it's true. Hope you guys enjoyed this next chapter.