Author's Note

This is my first story so tell me what you think. But please don't be unnecessarily rude or hateful.

The Princesses Meet a Strange New Being

Canterlot Castle

“Princess Celestia. Would you mind giving us a moment for an interview?” A pony with a microphone asked while walking alongside the alicorn through the castle.

“Not at all my little pony.” The princess responded in a kind tone.

“We heard that there were four foals found at the site of the monster attack earlier today. What exactly happened?”

“The guards found the group of foals fighting the unknown monsters that attacked Canterlot.”

“Really?!”

“Yes, after the beasts ran off the foals collapsed and they are now in the medical ward resting.” Celestia explained to the reporter while walking toward the door to the medical ward.
As the reporter was about to ask another question a feeling of dread and terror washed over them like a wave originating from the other side of the door.
The princess rushed through the door way and saw her sister, Luna standing by the bed of one of the foals with the Elements of Harmony standing close by. Like the others with him the young colt seemed to have been mutated by the strange aura of the monsters. He was completely hairless except for his mane and he had no tail or muzzle. Currently a dark aura was surrounding him and Luna seemed to be trying to cast a spell.

“Luna what’s happening?”

“Tia, there is an aura like a nightmare radiating from this colt and we cannot enter his dreams!” Luna exclaimed in panic.

“Let me help you.” Celestia said to her sister.
The two alicorns stood over the bed and closed their eyes while their horns glowed. Together they forced their way into the colt’s mind not noticing the image that projected form the colt showing his mindscape.

Unkown Colts Mindscape

The royal sisters saw what seemed to be a city made of glass and metal. They stood in a courtyard with a garden growing in the center.
Suddenly they heard a voice.
“Who are you?” It questioned, sounding like a group of ponies speaking at once.
They turned and saw what appeared to be a tall pony wearing a black cloak with a metal cape facing away from them.

“We are princesses Celestia and Luna. Who might you be?” Celestia questioned.

“Tia that is the nightmare, We can feel it’s evil!” Luna shouted.
The figure turned to face the sisters revealing that it wasn’t wearing a cloak and it wasn’t a pony. Its body was made of shadows, seeming to be both solid and made of smoke at the same time. As the thing raised its head they alicorns saw its face. It had no real facial features except for six long black horns curved in a way reminiscent of a crown, two rows of bone white fangs floating where a mouth would be, and three eyes, the right eye having a black sclera that was almost impossible to make out and a red spiral iris with a spiral pattern and the left looking like an orb that was filled with mist and a gleaming silver iris. Both eyes had plus shaped pupils formed by two white slits. Above those located in the center of its forehead was a third eye. This eye seemed to open vertically and was pure white except for the iris and pupil that were formed by a ring with eight sharp lines protruding from it and several concentric circles in the center.

“Nightmare? That’s a new one.” It said in its layered hiss.

“THOU ART NOT WELCOME HERE, BEGONE FOUL NIGHTMARE!” Luna shouted.

“The audacity you display, saying we’re not welcome when you stand in our home.”

“Silence! I won’t allow you to harm my subjects anymore!” Celestia said with a look of fury, her horn flaring with magic.

“If it’s a fight you want…” The thing said as music began to play. It then grew to at least twenty feet tall and rising into the air, its lower body becoming a vapor like tail, its teeth curving into a smile. “…Then it’s a fight you’ll get!”
With those words the metal cape on its back then split into ten long angular metal plates which hovered behind it in a wing like formation. The princesses fired two powerful beams of energy at the nightmare. Before the attacks could make contact two of the metal plates behind the creature sped through the air and intercepted the blasts before returning to their places.
Before the princesses could express their shock the creature spread out its arms revealing that it had six, two held to each side and two in front of it. Swords with long blades appeared in the four hands at its sides, two held normally and two held in a reverse grip, while the remaining two clutched a scythe. The scythe was black with its shaft shaped like a spine, at its end it had what looked like a black skull with no muzzle. The skulls mouth was open wide in a scream and protruding from its mouth was a long curved blade with a serrated edge.
The nightmare rushed at the sisters with its swords arcing through the air. The two alicorns spread their wings and took to the air while forming swords out of their magic and charged at their opponent. Celestia’s sword swung toward the things head while Luna’s was aimed at its chest. The thing caught Celestia’s sword between the blades in its left hands while one of its shields blocked Luna’s. It then flowed past them and stretched two of its arms forward thrusting its swords at their backs.
The two quickly teleported out of the blades paths. The battle went on like this for a while, with the princesses attacking from different angles and the creature stopping every strike and then attacking with its swords, and the princesses flying around the swinging blades.

The thing then broke the rhythm by saying.
“This has been a lovely dance, but We think it’s time to end this.”
As it said that it reared back its scythe in preparation for a swing. The princesses were about to fly out of the nightmares range when the scythes blade lit up with a black and silver shine.
With and exclamation of “Midnight Moon Cleaver!” the creature swung the blade sending an arc of silver and black magic racing towards the princesses faster than they could avoid it.
They attack hit the sisters and they were sent tumbling to the ground. The nightmare followed this up with a charge at the downed alicorns. The two quickly rolled away from its strike and got to their hooves assuming battle stances.
The thing smirked at this and did something that left the princesses stunned. It lowered its shields and reformed them into a metal cape.

Seeing their shocked expressions the creature said. “Since you two proved you are clearly stronger than We thought by getting up after our Moon Cleaver, We might as well be fair give you an actual chance to hit us.”
With that said the nightmare shrunk down to a size around a foot taller than Celestia and moved to the opposite side of the courtyard before getting into a fighting stance as well.
With a grin that spread across its entire face the creature shouted "Ready… Steady… GO!” before rushing at the two sisters who responded in kind.
Celestia swung her sword at the nightmares midsection while Luna fired a beam of magic at its face. The creature stopped Celestia’s sword inches from its ‘skin’ and then once again did something that shocked the sisters. It turned its head and opened its jaws impossibly wide swallowing Luna’s magic, then it gathered its magic in its mouth and fired a blast of blue and silver at Luna.
Luna quickly formed a shield and then charged at the thing in an attempt to sever its head. It moved its body around her blade and reformed itself a few feet away from them. The princesses charged their swords with as much magic as they could and rushed at the creature. The creature simply smirked and dematerialized its scythe. It then reached out and grabbed the alicorns swords stopping them both in their tracks.

“Checkmate.”

With that said the nightmare swung the princesses by their swords sending them flying to land in the somehow undamaged garden.

End Music

As the sisters looked up in fear the creature smiled and dematerialized its swords. The world then began to flicker in and out.

The princesses opened their eyes to see the colt looking at them with a smirk and their eyes widened with shock yet again. Because for a short time before changing into one black eye and one dull gray the colt had the exact same eyes as the creature had. The alicorns and everypony else present heard the same layered voice.

“Good game.”