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

This story was created initially under the name A Tragic Tale of an Equestrian High school Drama. Sorry for any confusion!

It started out like any other day. School was boring, dragged as it usually did. The girls arranged a studying period up at A.J's house. A secret is revealed and tragedy occurs when A.J goes down to fetch more cider.

One of the friends are attacked and wakes from a coma, changed.

Meanwhile, Anon-A-Miss strikes at Canterlot High and everyone blames one girls, including those she thought were her friends.

With no-one to turn to, she succumbs to darkness and the worlds only hope is a girl with whom neither got on very well.

Looks like the world is doomed.......or is it???

Ponyville has grown boring for Rainbow Dash. Sometimes, an entire week will pass between monster attacks.

What's a mare of action to do when her neighbors are all celebrating apples and hard work? When the weather bureau insists on gentle showers and sunny days, instead of something more exciting?

She has to find adventure, obviously. And when an airship captained by a pegasus pony flies through Ponyville one lazy summer day, dragging a flying iceberg behind it, Rainbow Dash realizes this might be the opportunity she's been waiting for.

But nopony ever said adventuring was easy.

REWRITTEN JUNE 21ST 2021

Torn from their plans due to a massive and uncontrollable storm over Ponyville, the Mane 6 must fend off dangers, find a lost filly, comfort others in the time of need, and make it through the night. But what happens when nothing goes according to plan? What happens when everything falls apart right in front of you? What happens when a storm turns into something much more deadly?

What happens when you leave three friends stranded in the Everfree Forest with timberwolves hot on their tails?

It's the deliberately coldest autumn day in recorded Ponyville history and Rainbow Dash, who's setting up the last of the weather conditions, has the town pretty much to herself as every other pony huddles indoors, hiding from the chill. This would normally mean a morning where nopony takes a single glance at her and decides she's a talking map with nothing better to do than personally guide them wherever they need to go, no matter how many hours it takes. And in fact, nopony does.

Just one familiar, arrogant jerk of a teenage dragon who wants to know how he can get to a certain cave -- and believes Rainbow has nothing better to do than take him there...

(Part of the Triptych Continuum, which has its own TVTropes page and FIMFiction group. New members and trope edits welcome.)

Now with author Patreon and Ko-Fi pages.

The Wonderbolts may be the greatest fliers in Equestria, but overseas in the griffin lands, aviation has become all but synonymous with the name of Gerard Goldenwings. Word gets out that the living legend is vacationing in Equestria, and rumor has it he's looking to take on an apprentice. Rainbow Dash is eager to meet him and prove herself worthy of his tutelage, but she must first perform one simple task: catching a certain special bird.

During a particularly snowy day off from school, Button Mash and Sweetie Belle head off and have themselves a grand walk throughout town. However, not all is well, as young Button suddenly feels the need to tell Sweetie Belle how he really feels for her.

Cover image not final, I just needed something to put up there. Will bellowing for a new one shortly.

Everyone knows Fluttershy is the kindest, most gentle, loving pony in all of Equesteria. What they don't know is that she's also a killer. To protect Equestria from the true monsters, Fluttershy has learned how to kill, to be ruthless, all in the name of protecting her friends from harm.

This is the story of Fluttershy, and how she learned to be cruel.

This story is a sequel to Rumble's Big Day

There is nothing wrong with Scootaloo. She just can't fly yet. Rainbow Dash knows this, and continues to work hard to get that filly off the ground.

There is nothing wrong with Rumble. He's just a little uptight about his flight practice. Thunderlane knows this, and keeps trying to teach his brother the fun and exciting aerial manoeuvres of the Wonderbolts.

Thunderlane is convinced Rainbow Dash is going to hurt Scootaloo if she keeps this up.

Rainbow Dash is convinced Rumble is going to hurt himself if Thunderlane keeps this up.

You know what they say: "If you think you can do better than me, do it yourself."

(Former working title: "SOON TO BE PONYGRAD'S FAVORITE FIC")

No one alive today can say where she came from; simply that she has always been there.

And yet, few ponies have had a greater impact on Princess Celestia's life than Raven, her most faithful aide.

Inspired by and based off of a headcanon put forth by Heir-of-Rick, though perhaps a bit less insidious than what he had in mind. He very kindly provided an alternate version of his image for me to use as my cover image! Text added by me.

All comments and criticism very welcome!

Featured in the Royal Canterlot Library! Go there to read the interview for some behind-the-scenes info on this story!

Translations: Chinese, Spanish!