Only fools, madmen, and adventuring parties go into the Malpheggi, the swamp beyond the Everfree Forest. It can be left as an exercise for the reader as to which of these categories Samus Marcus (a Thyatian swordsman, or so he says) and Ivan (his companion in trouble) fall into. When they are rescued by the registered adventuring party, the Elements of Harmony, a grand quest across the D&D world of Mystara begins. Together they face culture shock, international politics, romance, dungeons, and a dragon with a grudge as Marcus learns how to trust his new friends and make up for his past mistakes while the Elements of Harmony try to save Equestria from a threat which proves more... complicated... than they originally thought. Also, pie. And hats. A D&D (Mystara)/MLP Crossover.

Truth is the first casualty of war.

The world is in flux; new ideals, groups and technologies permeate every level of society in this age of discovery. The field of augmentation has allowed ponies to improve themselves in ways that were unthinkable a generation ago. Yet, for every benefit, there is an inverse. A griffon civil war rages on the borders, feeding the profits of mercenary companies. Rising populations have forced the rich and poor ever further apart. Harmony is dying.

Mortally wounded after a fatal attack on her laboratory, an earth pony researcher is augmented against her will and sent out into a chaotic world in search of answers. But as her quest unravels this chain of events, she discovers an ancient conspiracy that will shake Equestria to its very core.

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TVTropes Page

This is a fic based on the Time Loop Files, the format of which was first codified by Innortal on fanfiction.net.
Here's a brief guide.
The basic idea is, one character (the Anchor, usually the main character of a fictional setting) is looping back to the very first moments of their parent series every time either they die or some kind of time limit expires. They of course end up monumentally stir crazy given enough time.
Eventually others start to loop as well.
The reset is not always perfect. Sometimes a loop's history will be different to the "prime" loop, or canonical plot.
"Crossover" or "Fusion" loops also occur, randomly. These can involve the home loopers having a guest, or the anchor for one universe spending time in another, or replacements of one character by another.
Vacation Loops are where the Anchor (or others) decide/s "buck it" and lets off steam by doing whatever comes to mind. There's little or no attempt to maintain the original timeline.

In addition, and particularly more recently, it should be known that this story has a collaborative element to it - people may submit loop ideas or loops, ideally at the Spacebattles thread (a link to the current version of which is on the Trope page), and they may become included.

There's two page image options, thanks to Filraen - the current page image has been edited by the original creator from this work of theirs.. The other one is here:
http://hourglass-vectors.deviantart.com/art/MLP-Loops-466030169

Something has happened and Twilight finds herself in a strange and dark new world. The Bipeds here have strange magic, advanced technology, and a lot of problems. She needs a few friends, and they just might need her. WORM crossover. Deadpan29 has created some great supplementary material that is canon to the story.

This story is a sequel to Eljunbyro

A broken party of friends struggles to reunite.

Rainbow Dash continues to fly east.