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Luna walked slowly through the corridors of her castle.

It was the midnight hour and she could not resist a midnight stroll across the castle. She had done this a lot lately.

Celestia had forbidden her to enter the science lab, and Luna had spent many nights wondering what about. She had been preparing to go in sooner or later, but just couldn't pluck up enough courage to go against her sisters orders.

But she suddenly felt brave this night, and was heading to the science lab. She walked past Twilight's room(she and Cadence were staying in the castle for a short time) and frowned. She too had been forbidden from the lab, and was deeply hurt that her mentor did not trust her with this secret.

Luna wondered if Cadance was forbidden too, but to no avail.

But she had no more time to think; she was right in front of the lab door. She turned the knob with her magic to find it was locked. She groaned. She seeped her magic under the door and unlocked the door.

"Ha!" She exclaimed triumphantly."Bet Celestia didn't count on me doing that!"

But in fact, she had.

As Luna entered the dark and gloomy lab, she heard hoofsteps coming from another room. They were getting louder and louder.

Panicking, she threw herself into a little cupboard and waited. Through a crack in the door, Luna could see the edge of Celestia's wavy mane.

"Guard, I thank you again for taking this very late shift in the lab. We wouldn't want Luna getting into this very cupboard, now would we?" Celestia said, unusually sad. I saw the edge of her white hoof appear and disappear.

She had taken off her armour for the night and was ready for sleep.

"It is no problem, Princess. I only wish there was more I could do to help." The guard replied.

"You are helping a lot, in fact, tomorrow, you may have the day off!" Celestia added.

"Oh no, I cannot accept, your majesty. I have a duty to fulfil."

"Well, it's up to you, Snowglow. I shall leave you to your job then. Goodnight."

"Goodnight." And with that Celestia disappeared. Where had she heard that name before... Snowglow... Luna suddenly remembered the guard who always guarded Celestia's quarters.

Anyway, whatever her sister did not want her to see was in the very cupboard she was in.

Or maybe it was the one next door?

She decided to use a sedation spell on the guard, just to check. She just needed him to enter her field of sight.

And so he did. He was walking to the door when a spell struck his heart and he flopped to the floor, motionless. Luna sighed with relief and grinned.

She climbed out of the cupboard and looked into the cupboard next door. The cupboard was the same size as the one she was just in and she wondered how she had fit in it. It had a couple of empty beakers in it.

She then looked at the one on the left of the cupboard she was just in. Nothing but spiders and webs. She closed it and then got a proper look of what was in the cupboard next to it.

She creaked open the door. She gasped.

It was the very same armour that she had worn when she was Nightmare moon. She picked the pieces up with her magic and put them on the table close by.

She examined them for a minute and a sudden desire to become the nightmare everypony feared again reared up.

Luna fought these thoughts, desperately. She did not want to be Nightmare Moon again.

She did not want to go back to the moon. She had to put the shards back into the cupboard, and forgetting her magic, picked up the the armour and felt herself changing.

A strong light glowed from the broken armour. The guard suddenly jolted up and looked at Luna.

Black was crawling at the base of her hooves, and was growing, snaking up her legs slowly.

"Get Celestia!" She yelled to the guard. He raced out immediately. Luna threw the shards on the floor, hoping it would stop. But it didn't.

Her mane and tail began to grow in size. Her teeth changed into sharp, vampony teeth. The darkness that was spreading up her legs was now up to her body. Her legs were getting longer. Her eyes had changed into slits. She was becoming the very mare she despised.

Celestia, Twilight and Cadance all appeared in the room after a large yellow glow.

"Luna! What have you done!?" Cadance said, hoof to mouth. Celestia glared at Luna.

"I told you specifically not to go in here!" Celestia accused. Luna looked at her body; it was completely black and she was the same height as Celestia.

Luna, not knowing what to do, sat down on her rump and cried. She had not meant for this to happen.

"Luna!" Celestia's booming voice called out."Why?! Answer me!" She had no choice.

"I-I became curious!" Luna cried."You could've made up a lie to stop me you know!"

"I did not want to lie to my sister!" Luna was fed up.

She spread her large wings and flew out the window.

When she was faraway enough, she teleported to the Everfree Forest.