The Eternal Prision

Once upon a time in the land of Equestira, the where two royal  sisters who ruled the land, they loved each other very much

The older sister brought out the sun with her unicron power to make the day

and the younger sister did the same to bring out the night

However the younger sister felt unappreciated, her subjects shunned and depised her for reasons unjust.

while they praised her older sister and relished in her day

A civil war broke out, and the younger sister took part in that war

Many years pass.

The older sister received a coffin, carved on it was her sister's cutie mark

The older princess wanted to bring her sister back, no matter what it took

she instructed her student to build a machine to give her life

Reluctantly the student made the machine

The older princess succeeded in bringing her beloved sister back to life

However

The older Princess had suffered to much, her rage had not subsided

She could not forgive her traitorous subjects who had hurt her sister

Using the power of the sun she turned her wrath against her ponies, transforming the life giving machine into a weapon of death

Combined with sun energies the weapon devastated Equestria, turning the beautiful kingdom into a wasteland of death

The Older Princess became a death bringer that ended the war

The younger sister must have known, that the lives of many ponies where wrongfully taken to restore her life

The younger princess left her sister

As did the older sisters student, horrified at the monster her teacher had become

As did her remaining loyal subjects, fearful of wrath their princess would unleash upon them

Realizing the folly of her blind hatred the older sister saw that she had become an even worst monster then any villain she had ever face, she had become the very thing she swore she would protect her subjects from

Eventually Equestria became deserted ponykind without the guidance of their rulers became divided once again , the younger sister found love settled down and had a family

Seeing the state her former subjects where in she rounded up as many followers as she could and took them to a distant land where she made a new kingdom

She had help along the way one in the form of a former student of her sister whom she made an alicorn and a ruler alongside her

And together the new kingdom prospered

They name the new land, New Equestria in memory of the one that Fell during ht Great war

No one knows what happened to the older sister

Some say she died a bitter old pony, others say she still wanders this world, looking for her beloved sister she worked so hard to bring back to life

But if anyone had been their during her last moments they would have heard her utter her last words

"I'm sorry"