Recently rewritten. Contains occasional adult humor and violence.
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On a request from Princess Celestia, Twilight Sparkle and the rest of the mane six explore an abandoned mansion located deep in the woods. While doing so, they unwittingly stumble across an enchanted mirror that scrambles their DNA and pops out three brand new bouncing baby ponies. Hilarity and drama ensue as the mane six must cope with being suddenly thrust into motherhood, as well as protect their new foals from a dark god that wishes to use them for his own sinister gain.

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Fanart:
The three foals. by Freefraq on Deviantart.

Echo is a high ranking changeling officer. The Canterlot invasion was going perfectly, and her battalion had personally defeated the Elements of Harmony. Suddenly, she finds herself far flung from Canterlot, crashing into the Everfree forest. Now she is faced with a difficult reality - her hive, the only family she's ever known, no longer exists, and she must adapt to life as a pony. What she finds out about herself, though, will surprise her.

Rated Teen for occasional suggestiveness and language, tagged gore for brief violence, particularly in later chapters.

Dark because later chapters get pretty ... well, dark.

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Addendum 5/29/2018

This story is now, as of this addendum, five years old. It is getting more attention as I put out new chapters on the sequel.

I recognize that this story has problems, and that some of them by their nature carry over to the sequel; please remember that when I started writing this, I was not yet even old enough to legally drink in the US. A lot has happened and a lot has changed, and there are many things about this story I regret including, but which it is now too late to change. Some of those things I have simply done my best to ignore and make irrelevant, but some of them are errors from a 19 year old me that will haunt me until the sequel is finished.

In short, please be gentle.

A living meteor has fallen, bringing the threat of Equestria's destruction. The Elements of Harmony have broken, following Rainbow Dash's ultimate sacrifice to protect her friends, and they scramble to solve the mystery while the world prepares for war. Moving forward is hard with Rainbow Dash dead.

But peace in the world beyond proves elusive to Rainbow, and she'll never let her friends down when they need her. Not even death will stop her from coming back.

Currently undergoing rewrites on a semi-regular basis, please check recent blogs or the 'current projects' module on my user page for details.

Editing for remastered version by Formerly Committed and Shellsh0cker.

After a mishap with a falling star, Princess Luna crashes into Ponyville, only to be saved by Big Macintosh. Overly grateful, Luna calls upon an ancient contract which binds her to the draft pony as his personal servant. Can Big Macintosh co-exist with an overzealous moon goddess, her creepy assistant, and an army of evil looking guards long enough for Twilight to find a loophole to get him out of the pact?

Featured on 9/5/2012

This is a direct side-story spinoff to "A Twist in the Tail".

Edge used to be human. She used to be a man. Then one day, she was foolish enough to break into a Conversion Bureau to steal some Potion. Believing it all to be a plot to 'scoop out the brains of humans', he downs it. She wakes up as a pegasus pony with an audience with the princesses...

For her crimes, she is sentenced to community service.

This won't end well ;)

The potion used to transform people into ponies has gone through many, many interations. When one of the older potions is used, results aren't quite what was expected.

EDIT: I used a piece of fanart which I thought was wonderful as the cover image :3

A young inventor named Tinker has her life turned around with the arrival of a mysterious mare in a crimson cloak and a tattoo in the shape of a draconequus that runs the length of her body. When their fates become intertwined, Tinker will travel through time and space with the pony once known as Twilight Sparkle and witness the nature of her universe and the ponies who inhabit it.

(Spyro seriesXmlp) Spike's always been curious about his race, but then again what dragon wouldn't be when all they've ever known is ponies? So when a spell book arrives that may offer some answers to his questions, with a little help from Twilight of course, the young dragon is overjoyed to say the absolute least.

Though when things somehow end up going astronomically sideways, Ponyville finds itself playing host to three unexpected visitors; three scaly visitors by the names of Spyro, Cynder, and Ember to be exact, each bringing their own personal touch of chaos to the small town.

Soon awkward and unusual situations arise, tempers flare with destructive consequences, personal demons and ancient evils threaten to rear their long suppressed heads, and Spike learns that sometimes, if you wait long enough, love will find you.

Inspired by this piece of fan-art I found (not mine) featuring Spike and Ember, and the short comic 'Spyro's back'

Meet Cyr. He's one of the last of his breed: A Changeling Behemoth, living battering rams that are selected and mutated from the worker caste of the Hive. Aged from centuries of labor and service to his Queen, he grows disgusted and weary of the Changeling's plots and malevolent attempts to feed on love, especially after his capture during the Canterlot wedding. Thus begins a new (and possibly more enjoyable) chapter of his existence.

Princess Luna's Lunar Stallions kidnap Twilight Sparkle when they see how lonely Luna is, and give her to the Princess as a gift. Nightmare Moon emerges from Princess Luna's psyche during the sleepover. The dark goddess would love nothing more than to have the beautiful mare all to herself, and the resulting chaos forces Celestia to call a psychologist to sort out Luna's multiple personalities.