The Tale of the Three Sisters (REWRITE)
The Tale of the Three Sisters
Long ago, in the magical land of Equestria,
there lived three sisters. 
The youngest sister controlled the moon, rising and setting it each night. Her coat was midnight blue, and her mane was a shimmering sky of stars. The middle sister controlled the sun, doing the same in the day. Her coat was the purest of whites, and her mane was a long cascade of pastels, always moving in a nonexistent breeze. But the Eldest had the most powerful of all.
She controlled the earth.
With her power, plants grew to enormous sizes, 
and dead forests thrived once more.
But her power was none to be trifled with. She could raise whole mountains, and then easily smash them down again.
She kept the earth alive. Her coat was light green, which contrasted to her darker green mane, which swirled with flowers and butterflies.
The three sister alicorns ruled Equestria in happiness.
Then, a shadow crossed over the land.
A monster came. He had the body of a large black pony, but at the base of his neck, where usually a pony head was, there was a Minotaurlike torso, all red. He had two black horns and poisonous yellow eyes, with a stare that probably couldn't kill. He was not as fast as a Timberwolf. He was not as big or strong as a dragon. He could not turn ponies to stone with one look, like a cockatrice. He couldn't dig through the earth like a Diamond Dog. He wasn't even that scary, by appearance.
But that did not matter. He held a dark and horrible secret, one so terrible, it had been hidden by whatever creatures lived there past, for fear it would fall into the wrong hands. And, yes, it did, and in one of the worst hands possible.
It was a darkness that could "turn" ponies. Their happy thoughts would turn sour, and darkness would corrupt them, turning them into terrible grotesque creatures that only served him. He wished to enslave all of Equestria, and turn them into his own dark army.
He was truly evil. It did not matter what he crushed in his path. He had an evil in his eyes that could not be cured; and he used that evil to turn ponies. He had already transformed hundreds of ponies before the Sisters came to stop him. The sisters were horrified to see what had once been happy ponies now cruel monsters, and an anger alighted itself in their eyes. Any other would quail at seeing this blazing anger; but he was no other.
He refused to have his army fight the sisters, and said he would fight only the Eldest. She accepted, much to the wild protesting of her sisters.
And they fought. It was truly a battle. Anypony who saw them would say they were not mortals, but gods clashing. Lightning cracked with intensity as they fought, and the ground rippled and shook every time they head butted.
It went on for days. Then, weeks. Months and years passed as these immortals battled. Finally, one stood above the dead body of the other. Then, the Eldest smiled wearily, took a step towards her sisters, and collapsed.
He had been defeated.
A century passed, and all was well again. The Eldest had recovered, and now she and her siblings were flying over a small town near their castle. Then, a pain wracked through the Eldest's head, and a dark blast shot from her horn, hitting a space at the edge of the town. Suddenly, dark, ragged trees shot up from the ground, soon creating a dark forest. But it was an enchanted forest, only filled with darkness and monsters, spells and traps. The Eldest was horrified at what she had done, and fled to the castle, locking herself in her room. There, she gazed inside herself, and what she saw shocked her.
A black seed, with several dark roots in her heart.
For as the Eldest had struck the killing blow, He had placed a seed of darkness in her heart, knowing one day, it would grow and turn her to shadow.
The Eldest cried that night, not in pity for herself, but because she knew what she had to do.
She told her Sisters, who cried and begged her not to carry it out. But she knew she had to do to save her kingdom, and her sisters.
In a cavern, deep below the earth's surface, The Eldest stood before her sisters.
She placed the crown of the Ruler of Equestria on the middle sister, and told her to take care of the younger sister. She then turned to her younger and opened her mouth, but before she could get a word out, the younger leaped forward in a tearful hug. Wiping a tear away, The Eldest embraced both her sisters.
They stayed there, hugging, for what seemed both like the longest and shortest time. Then, sadly, the Eldest broke the embrace, and with one sad smile, she backed away into a much smaller cave and closed her eyes. Then, harnessing all her power, she grew a nearly impenetrable wall around her, sealing the cave off.
"Goodbye."
Thousands and thousands of centuries passed. The Middle and Younger sister ruled Equestria in Harmony. But the Younger grew jealous of the older, as all the ponies played and sang in her glorious day, but stunned and slept through her own beautiful night. Her jealousy went so far, she turned into a wicked mare of darkness: Nightmare Moon. With a heavy heart, the older had to harness the Elements of Harmony, and banished her younger sister to the moon for a thousand years. When the younger finally returned, six mares, the Element Bearers, cured her of her darkness. And all was well again....
Then, as a newly crowned purple Alicorn sang out how everything was going to be just fine, deep underground, in a desolate cavern....
A crack appeared.
