Her heart was broken. Her reputation in Ponyville was in ruins. A menace, they called her. Said she wasn't a real hero. Blamed her for the sudden disappearance of their real hero, Mare Do Well. She'd even been abandoned by her five best friends. Everything she thought she could count on was destroyed.

Bent on vengeance and driven by her raw emotions, Rainbow Dash becomes a villain that Ponyville won't soon forget. But she soon finds that not everything in Ponyville is quite what it seems.

Special thanks to DragonShadow, who pre-read and helped me revise this story. Thanks also to JofY, who gave suggestions for the second revision.

The comments are full of unmarked spoilers, so watch out.
Obviously, this contains massive spoilers for the season 2 episode "The Mysterious Mare Do Well," and one must have seen it before this story will make much sense.
Rated Teen for violence and some blood.

Stallions Applejack, Rainbow Blitz and Butterscotch live in this crazy town of Ponyville. And they have to deal with neighbors harassing them, old enemies stopping by, chasing girls and more.

Magic Fall. A phrase that conjures in the minds of ponies, a time of great strife and death, when magic abandoned pony-kind and left them to fend for themselves in a hostile world. Luna now sits alone on the throne as she has for the last one thousand years and watches as technology slowly but surely fills the gap that was left.

The Worlds Fair is in full swing in Canterlot and with the launch of the first ever Celestia Class airship, 'The Harmony', many predict a new era of peace is to come. But when disaster strikes and nearly takes the princess out of the picture, one pony who dreamed of flight will take to the skies and save Equestria.

This is the story of RAINBOW DASH and her MARVELOUS MECHANICAL WINGS...

Rainbow Dash, the powerful mare bearing the Element of Harmony, through an unfortunate and unknown turn of events, finds herself in an entirely different world. But it's not a different world, only . . . a different time.

She finds herself over a thousand years in the past, thrust into a prophecy unknown to her and into a war with the demons of Tartarus, the weight of a world laying weak and quivering in her hooves all the while.

So this is kind of my Magnum Opus right here, I've spent the most time planning it, had the most editors and pre-readers go over it, and I'm pretty sure that I did a good job. So . . . did I?

Day in the married life of Rainbow Dash and Time Turner.
Of course, it's not just any day...

In a world where Rainbow became princess instead of Twilight, what would happen between the group? Would they all be happy or will tensions rise? Rainbow Dash reflects on all of this before her great coronation.

My name is Shadowmere. I'm just trying to live my life, but I have a special condition that doesn't let me. I've been running from town to town trying to escape the hate that's been following me since I was small. Any friends that I've had have left me when they learn who I really am. I've been traveling around Equestria with my younger sister Bright Skies. She's all I have left now. I've been rejected and hated in every town I've gone to, but I don't blame them. If I knew that there was somepony in my town that was a monster I would probably hate them too. I'm about to go to a new town maybe it will be different, but I don't expect any such luck. Nopony has ever accepted me or even tried to. I hope I can at least stay here for a while before I have to leave for a new town again.
I'm Shadowmere, I know fear, I know hate, and I know darkness. I know everypony's.

/*
This is my first story any feedback would be appreciated.
Possible change in tags and characters as story progresses.
I now also feel obligated to inform readers that this is not some sort of crossover with the video game, The Darkness. If it was Shadowmere would have a lot more snake tentacle monster tendril things. This idea was derived from my own insane mind before I even knew of the game itself. Though there are some similarities the story is its own.
*/

Did you ever wonder why Rainbow Dash had a rainbow mane and nobody else did?
Maybe it never crossed your mind that a rainbow is more than a superficial trait.
A little while after Rainbow fails her Wonderbolt audition, her friends begin to notice that her iconic rainbow mane and cyan coat are literally leaking color, leaving behind a shallow, lifeless shell of what Rainbow Dash used to be.
Without the old Rainbow Dash, everything seems to be thrown out of balance in Equestria, and the elements of harmony can't function. Together, they attempt to bring back color to the one they care for he most.
Through medical study and the magic of friendship, Equestria will finally understand Rainbow Pegasus ponies, and the existence of rainbows entirely.

She is Loyalty. She will be the last one standing by her friends, in peril, torture and death.

This is what everyone believes. This is what Twilight and the other Spirits of Harmony, Rainbow's friends, believe. And they took it entirely for granted. After the Mare-do-well incident, Rainbow Dash's Loyalty began to falter. She still felt the terrible sorrow of being deserted by everypony, to be forgotten in the shadow of a greater hero.

Over time sorrow grew to anger. As the powerful bond of friendship crumbles as Rainbow begins to drift away, The others discover just how powerful the Element of Loyalty is, and how its absence might have caused the downfall of the greatest heroes Equestria has ever known.

Discord, for a master of chaos, was actually a very good planner. Despite the confidence that he would bring Equestria to its knees in mayhem, several millennia of experience had taught him to have a back-up, no matter what. And after watching from the sidelines as Princess Luna became Nightmare Moon, he knew he had found an ace in the hole. Despite his defeat, Discord's greatest trick was still to come.

You know what this means: Equestria's greatest Nightmare is back. And this time, she's not alone.

Edit: Featured 9-27-2013, first time I've had a featured story. Thanks to everyone who's stuck by this story in spite of admittedly slow updates!