As night falls, the ponies went to sleep in their respective quarters to discuss importantly with Anub'arak and Kel'Thuzad how to turn back Twilight to her old self. Fluttershy had been sleeping in her quarters, and didn't sleep well quite enough. She had horrible nightmares about her friends. Nightmare's of eternal darkness, her being evil also. She is not able to sleep that well. But, moments later, when she is still sleeping, she heard a voice at the back of her head, saying:
"Well, Fluttershy, I supposed your wondering what to do next, have you?"
"Well, no. But, she is more powerful. How are we gonna suppose to defeat her, without the Elements of Harmony?"
"I heard from Kel'Thuzad that dark magic is the only cure, and needs 2 more people to do it, right?"
"Well, yes. But, I'm not a unicorn or alicorn just to have the arcane magic of darkness."
"Well, I could fix that."
"Really? But how?"
"I will give you that arcane magic, with a price of course."
"What is the price?" Fluttershy asked nervously in fear.
"The price is that the power will scar your soul. You will become something that nopony ever realize."
"Your referring that the price is my soul. Then, I don't want that! Even though it's for my friend!"
"Have you ever realize that Twilight has becoming even stronger each day, have you?"
"No, but-"
"Then take this, and you will have the power, with Kel'Thuzad, to bring your friend back." Then, a swirl of black mist appeared in front of Fluttershy's face, with an ice sword sticking out of it.
"Take it, and the power is yours."
Fluttershy didn't resist the offer, so she took the ice sword, just for the sake of her friend. Immediately, the mist surrounded her for a few minutes, before dispersing to reveal the new Fluttershy, uttering:
"Now, we are one!" She then stepped out and saw Kel'Thuzad and Anub'arak, and walks to them.
*At the balcony, the same time*
"I would feel bad for Twilight Sparkle. A personal student of princess, only to be transformed into evil." Anub'arak.
"Yes. However, with black magic to only cure for her, it's even more difficult to heal her." Kel'Thuzad replied.
"I would help you."
The two undead beings turn their heads and saw Fluttershy, but she was different. Her eyes has become black, with blue pupils. She wears death knight armor, with her mane and hair paler to their original color. She also carries an ice sword, like Arthas' runeblade Frostmourne. Her hair, although paler pink, has some streaks of other colors as well.
"Good evening, gentlemen. I supposed you were surprised at my new form."
"Not at all." Both of them replied.
"Well then. I supposed that we should discuss a plan to get Twilight rescued, right?"
"I think so. But we will discuss it tomorrow morning."
"You realize that Twilight will find something that could kill the one that got her evil in the first place?"
"Perhaps. Regardless, we must speak it out tomorrow. And Fluttershy."
"Yes?"
"Get yourself hidden because they will think you are evil as well."
"With pleasure."
*The next morning*
The ponies wake up from their respective rooms, and readied themselves for the meeting. They then trotted to the meeting hall. After a few minutes, Princess declared:
"Let the meeting begin. You first, Luna."
"Thank you, sister. Now, as we know, Twilight Sparkle has become evil. Now Kel'Thuzad....Wait, where is Fluttershy, Kel'Thuzad and Anub'arak? They should have been here right now."
"Yeah. Where are those 3?" Rarity asked.
But before they could guess the question, a guard came up and spoke to Princess Cadence, which widened in shock.
"Why? What's the matter?" Celestia asked.
"T...Twilight is here."
"What?!"
The ponies ran towards the main gate, and saw Twilight beating up multiple guard ponies with her dark magic. Princess Luna then shouted:
"Stop!"
"Oh hello there Princess Celestia. I supposed I would now beat you up with my new magic, do I?"
"I-" Luna began but was cut off by Celestia.
"Never! I will not let you harm them!"
"Come then. You will now know that I'm powerful than you are."
The two ponies then charged their powerful spells, then fired at each other. As the battle intensified, Twilight has the upper hand. With every passing minute, Princess Celestia began to weaken. Then, she was flying towards the wall and hit it. Everypony didn't believe it. Celestia got beaten by her own personal student. Twilight then moved towards Celestia, and a spear emerges from her black mist.
"Goodbye, Celestia." Celestia closed her eyes, waiting for her end. But before Twilight could kill her, an ice sword breaks the spear from her grip, flying it towards one of the pillars. Angered, Twilight turned her head, only to find somepony like Fluttershy, but the colors are paler. She holds the ice sword.
"Who are you pony?"
"-Laugh- I thought you'd never asked. I am Fluttershy, only know just to stop you from killing Princess Celestia."
"Fool! You will be killed."
"-Chuckle- Let's fight then."
Twilight then got a dark sword, and the two battle it out. The ponies are staring in shock of the battle, with the 2 exchange blows with each other. Twilight soon wears out, and Fluttershy lands a good punch on her face, sending Twilight towards one the walls.
"You will pay for this!" Twilight's horn starts to glow, but before she could cast the spell, an ice spell hurls towards her, and freezes her horn.
"Stop you mindless one!"
"Onward for the Scourge! Stop her in Arthas' name!"
Twilight turned her head and saw Kel'Thuzad and Anub'arak, with their faithful soldiers. She then saw Fluttershy, hissed and said:
"This isn't over!" She turned into a black mist and went away. The ponies that watched were in awe. Rarity then move towards Fluttershy and asked
"What happened to you dear?"
"I will answer that question later. Right now, we will need to prepare." Fluttershy replied with Kel'Thuzad and Anub'arak nodding in agreement.