The two alicorns and twitching unicorn stood in silence in the library.

"So, you two are sisters?" Twilight asked.

"Aye." Nightmare said. "Before she cast us away, to be locked within our pride. Our night."

"You wanted to bring eternal night." Celestia stated calmly. "The lack of sunlight would have killed every crop, frozen the land and would have also brought Discord back faster. And he would have surely defeated you."

"Defeat us? Neigh, we think not." She sneered.

"Would you two stop!?" Twilight yelled before wincing. "You sound like your yelling." Twilight groaned, rubbing her head. "You both have your reasons, but for now, could you stop to help me?"

"Yes," Celestia said. "Why would you need the help of a being who posses such dark magic? I have no idea."

"I said I need help finding a pony." She gritted her teeth. "So I can kill him."

Celestia's eyes widened, her face paled to an even brighter white.

"It's not what you think." Twilight said. "I've been tracking him... For-"

She gave a yelp of pain as the libraries door was slammed into the wall. Rarity, Applejack, Pinkie Pie, Rainbow Dash and Fluttershy came in.

"Alright, we want answers!" Rainbow Dash yelled. "And we want-"

Twilight shot up and pinned her against the wall before releasing a roar shaking books, the windows cracked and every living being inside the tree went quiet. Rainbow Dash froze, whimpering slightly as she looked at the snarling unicorn.

Twilight got off and shook her head. She looked back and frowned.

"Sorry, it just hates loud noises before the change." She said. "My head is killing me..."

"The wolf blood within her is strong." Nightmare chuckled. "Yet, she resists it? We art most curious as to why."

"I don't exactly feel like tearing ponies apart." She coughed hoarsely. "Now, a-as I was saying. I've been tracking a pony, the one who did this to me. Cursed me."

"Doth thou know of his name?" Nightmare asked.

"I've been able to get a name." She growled. "Excuse me, I-I need to see if Spike is here."

As if on cue, the dragon came down the stairs. He stopped when he saw Nightmare and face-clawed.

"So, your the infamous Nightmare Moon." He said in a bored tone as he looked up at her.

"Art thou the one know as Spike?" She asked. "A dragon apprentice to moonblood. Thou art strange for thy kind."

"And I thought you'd be taller." He replied with a roll of her eyes.

"How dare-"

"Save the theatrics moon butt." He said. "Did you need something Twilight?"

"C-could you go prepare some tea, a-and make the guest bed?" She asked. "Princess Celestia, could you take me to my room in Canterlot? I-I need some things from there."

Spike groaned, Celestia nodded and teleported them both to Canterlot.

"Alright, until they get back." Spike began. "Not a single one of you touches a thing. Got it? It took me all day to organize the books."

"Thou do not-"

Spike let loose a small torrent of flames, singing her mane.

"When I say something, you will listen. I may be smaller, but I have teeth and jaws made to crush diamonds. And my fire, isn't just for scrolls. Now sit down while I make tea."

All the ponies sat down, amazed that he was commanding a goddess. Nightmare took off her helmet, letting her ethereal mane fall down past her shoulders.

Canterlot

Twilight found herself in her room again. She looked around for a second, remembering the position of the books and even taking a glance outside. The large window was fully open, letting the room be bathed in moonlight. She snorted before closing the curtains with her magic.

"What are you looking for Twilight?" Celestia asked.

"A chest. I hid it well enough so that only I could get to it." She replied, lifting a rug up. "Here."

She shot a small trail of silver light down onto the floor boards underneath. They began to shake before rising up, a shot of dust hitting her as they stopped and a large chest was lifted up. It was a large iron chest, the edges made from steel and a single lock made of gold. She wiped it away from her eyes and put her horn into the lock.

It gave a click before opening; inside there were only three things. A hooded cloak, her fathers crown and a large tome. It was stitched together, the brown surface lighter and darker in some areas, the pages looked yellowed and had bits of paper sticking out. She took them out and nodded toward the princess.

She lit her horn again and teleported them back to the library. What they saw made them stop and blink in confusion.

Spike was sitting next to Nightmare, both of them looking over a book. The other ponies were at the other side of the room, shaking.

"Are we interrupting?" Twilight asked as she set the items down.

"No," Nightmare forced out. "Was that correct young drake?"

"Yes." He smiled slightly. "You're a fast learner. I can't believe you're learning within seconds."

"Learning?" Celestia said. "Learning what?"

"The hatchling is teaching us how to speak properly, in this era's way." She said. "We art having slight trouble."

"Really? Why would he be doing that?" She eyed him warily. "She has not tricked you, has she?"

Before her half sister could respond, Twilight gave another growl. All eyes turned back to her as she opened the tome.

"Nightmare, I brought you here not only for help, but to make a deal." She said. "You help me find and kill my target, I let you take my body as a new host."

"What use would that do us?" She asked. "We control an alicorn, what greater power is there?"

"If you didn't notice... My cutie mark is magic." She said. "I represent magic itself."

Nightmare's eyes widened, her jaw hanging slightly.

"We... Agree with thy conditions." She said. "Now, who is the target?"

"His name is..." She clutched her head for a second. "Ah! F-Fluttershy...?"

"The yellow one?" Nightmare looked at the shaking pegasus. "Very well."

"No!" Twilight yelled. "F-Fluttershy, could you take a shower. A-And use a heavy scented shampoo? I-I can smell the animals on you." She gave a bark, scaring Rainbow Dash. "And it hates animals."

Fluttershy blinked once before rushing up the stairs and to the bathroom.

"H-His name, Nightmare," she began again. "Is Shirley Silver."

"Shirley... Silver...?" She said hollowly. "That traitor!" She yelled; she stomped a hoof letting her eyes flash white. "We will gladly kill him for thee. He was the first moonblood, the only to betray us, and if he still breathes, he shalt no more when we find him."

"Wait, hold up," Rainbow spoke up. "Your like a thousand years old, and if he's still alive, how old is he? And how old is Twilight?" She asked.

"Each moonblood," Nightmare began. "Is not only granted the gift of wolf's blood, but an eternal life. So long as they kill each full moon."

"She's right." Twilight said. "I don't remember much from when I was first cursed, but I know it was a very long time ago. It, the wolf, has killed so many, and I let it, just so I could live to track him down." She scowled. "And once he is dead, I can finally die as I want. As a pony." she smiled as she picked up the silver crown, rubbing a hoof along the smooth surface. "Just as father would have wanted..."

"H-How old are ya?" Applejack asked.

"What day is it?" Twilight asked.

"The twentieth of June." Rarity spoke up.

Twilight's expression fell, and turned to one of regret. "Four hundred and eighteen years of death." She sighed. "This has to end this year. I-I can't live like this any longer."

"We will come with thee on thy quest." Nightmare said standing up.

"No!" Celestia said. "You will not go anywhere with my student!"

"This is my choice." Twilight cut in. "But you can't go like that. It would draw too much attention. Why don't you chose another host?"

"Another? But who?" Nightmare asked.

"I volunteer myself."

Every resident int he room turned and saw Spike standing int he doorway to the kitchen.

"And I'm going with you, Crimson." He winked at Twilight. "Like it or not. So, do what you need to do and make it quick. I still need to get Crimson in her cage for tonight."

Nightmares fur and mane, slid off like a fog. When it left, a small blue alicorn was left, panting on the floor as she dropped with a thud.

Nightmare went up in the air and shot into Spike's nose, his eyes widened slightly before he gripped his throat. He fell to the floor in a coughing fit, just as the last of the wisps disappeared. He sucked in a deep breath before sitting up.

"I-I don't feel any different." He said looking at his claws.

He gripped his head once before his purple scales were covered in steel plating, each of them bending over each scale. The scales on his belly turned pitch black, and his spines and eyes turned a deep purple. He sucked in a breath, exhaling a plume of smoke; she grinned, chuckling.

"Interesting," Nightmare spoke. "We have not inhabited a dragon before... Ti's most interesting."

"C-Come on... We can continue in the morning. A-After I don't have to worry about tearing all of your throats out." Crimson said, shaking. "Oh, a-and Princess Celestia?"

She merely glanced at Twilight as she hugged the smaller alicorn in her white wings.

"My name is Crimson Moon. I'm tired of being c-called a lie." She said.

She snapped at a shelf and tore a chunk of wood out. She quickly hurried down the steps of the basement, Nightmare in tow.

The basement was an open area, except for the large cage in the middle. Roots dangled won, catching Crimson as she nearly ran down.

The cage had no bars but instead thick walls. A circular wheel was the only way in, unless the one inside were to push the walls apart.

Nightmare looked inside and saw the walls were covered in a clear gem. Chains glowing slightly poked out from the walls, all of them too large for the mare as she slipped them on. And standing in the back, in a smaller corner bent in, was a small deer.

Nightmare stared at it for a second, blinking as it stared at her almost pleadingly.

"A-Alright, close the door and lock it." Crimson said facing the deer; she slipped the chains over herself and let loose a howl. "Now!" She half yelled, half roared.

Nightmare closed the door and let Spike lock it. as soon as they did, Crimson screamed out and the cage began to rock back and forth as she bashed against the walls.

When she went back up the steps, she saw everypony flinch when a roar pierced through the cage and floor. Their faces were blank, even Fluttershy had come back down and was motionless.

"Relax," Spike said. "She and us are in no danger." He said. "This isn't the first time she's had to do this."

"But what if she gets out?" Rainbow asked.

"It... Wouldn't be the first time." He chuckled dryly.

Author's Note

Nightmare will be speaking slightly more modern but will keep her old dialogue as well. It's hard making complete sentences with her... But I'm doing it!
Sorry about the bad roar. But I felt I needed to put that in.