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In the land of Equestria, there have been many stories and legends told by many and have been carried down since the start of the Regal Sisters power of ruling the land. The main stories that have been told were common at this point in time, like the founding of Equestria, the reign and defeat of Discord, and the banishment of Nightmare Moon.
But there is one legend, that has been long since forgotten by many, but only the Regal Sisters know of, and it all started 5000 years ago.
After the defeat of Discord and discovery of the Elements of Harmony, a mysterious entity had come to the world. The entity didn't seem to be threaten at first, but after a few weeks it began to cause chaos to land, chaos only Discord himself could ever dream of doing. It slowly began consuming the world, absorbing the darkness within the hearts of ponies, and eventually manifesting into a creature of pure evil and darkness, with the intent of destroying all life on the planet.
The princesses were called into action to save their land, by using the power of the Elements of Harmony. But, this proved to be ineffective as the entity was too much for the powers of the Elements alone. When all hope and life as ponies knew it were lost...
...A mysterious figure appeared out of nowhere, and lend the sisters a hand. Wielding a mythical, ancient blade of harmony itself, the figure used the full power of the Elements and smites the evil one away, bring light back to the land.
This figure came to be known as the Hero of Realms, who came when a world was on the verge of collapse as it became unbalanced when a threat has been made to not just the world, but the dimensional plane in which it existed in. As fast as the hero came, he vanished never to be seen or heard of again as he left the world of Equestria, to make sure other realms were safe and in balance.
Before he departed, he entrusted the mythical blade of harmony to the Regal Sisters, as a gift and a sign of his friendship. The sisters then banished and sealed what was left of the evil entity to the deepest part of Tartarus, hiding the blade away where it would never see the light of day again, and to be used as the key to the seal.
It wasn't until 2000 years later, the younger regal sister turned into the Mare of the Moon, due to her resentment and jealousy of her older sister and how her subject favored the day over the night, and was banished by the older sister using the powers of the Elements of Harmony to the moon for the next 1000 years.
For the next 1000 years, the older sister reigned the land of Equestria alone, feeling remorse and regret for having to banish her little sister, as well as learning that the seal that is keeping Vexis in check, is starting to weaken. She doesn't address this to anypony to keep them from worrying, as well as not reminding them about the evil that nearly wiped out their world. She keeps a close watch of the seal during this time, only waiting to reveal the event when the time comes in the future.
1000 years have passed, and on the night of the 1000th year of the Summer Sun Celebration marks the return of the corrupted younger sister, known as Nightmare Moon, after her banishment and threatens to create an eternal night all over Equestria, thus causing panic to the small town of Ponyville.
It is when a young unicorn, who is the the older sister's protege, and her five new friends go and stop the Mare of the Moon, by harnessing the power of the Elements of Harmony, defeating the corrupted princess, and returning her to normal and reunites with her older sister after 1000 lonely years.
Years have passed, as the six young ponies that stopped Nightmare Moon, have kept Equestria safe from most threats that came their way. The young unicorn, Twilight Sparkle, became the fourth princess of Equestria, under Celestia, Luna, and Cadance, the Princess of Love and co-ruler the Crystal Empire. Soon after the return of magic thief Tirek, Twilight and her friends discover their keys in unlocking a chest, that was given to her from the Tree of Harmony, the original and now current, resting place of the Elements, unlocking the power to banish the monster back to Tartarus with the power of their friendship, granting Twilight the title as the Princess of Friendship and establishing her new kingdom with a new castle that was given to her from the mysterious chest, now overlooking Ponyville.
However, while the gateway to Tartarus was open when sending Tirek back, something got out...
The one thing that the Regal Sisters worried would happen, as they knew now, their world was not yet safe as a new, but anicent threat arises...
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Three months have passed since Tirek was banished to Tartarus again and peace in Equestria seemed to have be restored. However, in Canterlot, Princess Celestia was busy with her usual mountain of paperwork when her younger sister, Princess Luna, has come into the throne room with distressing news.
"Tia! We have some distressing news about....you know what...!" Luna said, giving her a stern and worried look.
Celestia, looks down to her sister, frowning and nodding knowing what she means. She looks to the guards that were in the room, "I need to discuss something with my sister in private...please leave us."
The guards nodded as they all began to make their way out the throne room and shutting the doors behind them, with just the two princesses.
Celestia sighs, looking down with much concern, "We both knew it was only a matter of time, Lulu. Things were looking up too, ever since Twilight and her friends sent Tirek back to Tartarus, but they don't even know of the evil that will likely befall our world again..."
Luna walks up to her older sister, as she sits down and has a comforting wing over her, trying to ease her worry, despite being just as worried. Celestia returns the favor and nuzzling her lovingly, "We may have time, I do sense the entity somewhere in Equestria, but I can't pinpoint it exactly. Wherever it is, it knows that it needs time before it will grow in strength again."
"We must act fast, dear sister. We must call in Twilight and her friends, and reveal the truth of what has been sealed for almost six thousand years... they need to be ready, as do we. Even we know that the powers of the Elements of Harmony alone won't stop this creature..." Celestia said directly, looking at the stained glass window of achievements that those who helped Equestria in the past, namely Twilight and her friends stopping Nightmare Moon and defeating Discord.
Luna gets up as she looks back to her sister, "But...even if we prepared ourselves...he won't come back..." Celestia looks at Luna, knowing who she was referring too, and looked down with a frown, "I know...even though he didn't stay in Equestria for too long, he still did so much for our world in the time he was here and left. But we have to face the facts that he won't return..."
Both sisters began to think on how they could get extra help, knowing full well that their power alone isn't going to be enough. Just then Luna smiles, "Ah! We could summon someone from the outside realm! I mean, we would need to focus as much of our magic to bring forth a warrior from outside this world!"
Celestia raises a hoof up to her mouth, at the thought, "Hmm...it might work. Only thing is, it would be difficult. We would need to focus all our power into finding one that knows what he or she will be up against, and as well as one is very understanding in the situation we dragged them into."
They both nodded as get up and walk to the center of the room, both standing a few feet from each other. "I never thought we'd be actually doing this kind of spell Tia. I mean it is a pretty powerful spell to summon one from outside the realm." Luna said, staring at her sister with concern.
It is true, as this was the first time in which Celestia or Luna, actually decided to perform a spell that may or may not be dangerous, giving that it needs time for preparation, but since time for them wasn't of the essence, they needed to act quickly.
"We must try to not wear ourselves out too much. Let us hope that there is at least one warrior that could be summoned easily beyond here." Celestia said sternly, as Luna nods.
They close their eyes as both their horns began to glow. Both struggle as they begin creating something on the floor in front of them, which began to warp a bit.
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In an unknown area of the Interdimensional Rift, where it was all dark with many stars shining about and different holes that lead to places unknown, a lone traveler was walking about. He stops as he begins to sense something, something big. He walks to where it was coming from, and soon can hear a voice, well two voices that sounded like they were combined together.
"...Huh? What is that...talking?" The figure revealed to be a young man. He looked around and walked for what was like an hour as the voices echoed through the empty Rift, but soon, discovered the source. He stops and find what appears to be an odd looking portal. He could now hear the voices clearly.
"Is that....some sort of....summons? Is someone trying to call for help?" Then, the blue object around his neck glowed faintly, as if it was resonating with the portal.
"...Well, you glowing could mean one thing..." He smiles lightly, since not only it was likely the summons was for him, but he was going to visit a new world. With that in mind, he walks into the portal, not knowing where it would take him.