This 'Earth' is so close, and yet so far from anything Twilight described on the other side of that mirror. How is Rarity going to get back to her home when she can't understand anyponybody? And didn't Twilight say she became human, and humans didn't use magic? Yet clearly some did... and that wasn't even counting all the devices that might as well have been magical, as far as Rarity was concerned.

Who knew one strange little gem could cause so many problems? They'd taken it from her after it'd brought her straight into a lab for study, but... If she ever found it again, she was definitely going to let Spike eat it. As soon as she got home. And by Celestia, she was going to get home!

...Will Rarity ever find her way home? Is the gem that brought her to Earth the key, and is there more to the factions maneuvering around her appearance?

To complicate matters, this is an Earth recovering from its first alien invasion (Rarity being technically the second, then). ...Or does that actually explain things? No, no it doesn't. But it will.

------------------------------------------------------
To go with the Teen rating (or rather to explain it) there is light profanity and violence. I don't believe either are at a level where the warning tags are needed, but I'll mention it at least.
There may be some darker, more explicit moments in flashbacks, but I'll save those for Interludes.

The Tears of Gaia. An artifact of unmeasurable magical power from the Ancient Days, when the Others ruled the land. If found, they would be the discovery of the century!
At least, those are Twilight Sparkle's thoughts. But something is stirring in lands to the south. Soon she will find that she and her friends are not the only ones who are after the legendary Tears. And so what starts as a simple research trip is soon to escalate into the greatest journey of the young ponies' lives, filled with new friends and foes, incredible danger and great adventure!

Accolades:
EqD featured- 21/09/2012
Now with its own TVTropes page right here!

NOTE: While I do appreciate all comments I get on this story, I would personally prefer if they could say a little more than the typical "Awesome chapter, I love it!" or whatever. What do you love about it? What struck you in this chapter? What would you like to see explored or expanded? Are there things you don't think are working and if so, how could they improve?? I have a pretty determined vision for this story, but it wouldn't hurt to know for the future!

A young princess comes of age, ready to take the reins of her new dominion. But there are whispers of old prophecies and terrible powers returning. Can this princess hold it all together and solve the thousand-year-old mystery with the help of her trusted mare-in-waiting?

Princess Celestia certainly never told her to expect this.

Prereading assistance by Monochromatic and Timaeus
Artwork commissioned and done by Arcticwaters.

Everypony has one 'Longest Night', a night that just never seems to end, whether they want it to end or not. For Celestia, her Longest Night began on the first night she had to raise her sister's moon.

Heartbroken and filled with despair that she may never see her sister again, Celestia makes a wish upon a falling star to see her sister one more time. Little did she realise that the stars listen.

A one-shot story of two sisters, and one Faithful Student.

Side-quel: Myths and Birthrights

Partially inspired by Ponyphonics amazing song 'Lullaby for a Princess'.
Cover art used with permission by InuHoshi-to-DarkPen.
Special thanks to Honey Mead and Iroh for helping iron out some details.

A holiday mystery in Canterlot, unsolved for as long as anypony can remember, leads a teenaged Twilight to ask a simple question: Why steal cake?

As her favorite detective has discovered in every book of the Sable Sleuth series, it's often the simplest of questions that will lead a pony down unexpected paths. As Hearth's Warming Eve approaches, and the deadline for the next theft looms, will Twilight Sparkle be able to unravel the mystery behind the Cake Thief?

Cover Art by the talented Simbaro.
Editing by Minds Eye

This story is a sequel to Little Choices

In the aftermath of the fall of Canterlot, Princess Rainbow Dash and her friends have found themselves in the newly restored Crystal Empire, seeking a power that they can use to push back Queen Chrysalis and save Equestria. But with the history of the Empire shrouded in darkness, finding this power will prove a challenge.

To make matters worse, a shadowy presence lurks at the edges of the Empire, and the Changeling Swarm will only take so long to discover where the last remaining princess has gone. The pressure is mounting, and even though she feels she isn't cut out for this, Rainbow Dash must step up to her station and lead her friends, and the Empire, to save Equestria... or lose everything she holds dear.

Cover Art was drawn up by the absolutely incredible Novaintellus. They are one of my favorite brony artists, so please, go show them some love!

Never thought I would write a story that necessitates this, but beware the spoilers in the comments!

"Tales" series minor crossover, largely Tales of Xillia; concepts and abilities such as artes are borrowed and the storyline itself is tailored to reflect the general Tales design.

Twilight Sparkle finds life in Ponyville exciting and enjoyable: every day brings her a new friendship lesson or a challenge to rise to. She is as devoted as ever to living life the way she was taught a good pony should, and making Princess Celestia as proud as she can.
When Princess Celestia recalls her to Canterlot, Twilight discovers that not all of Equestria is as happy as she had once thought. Power outages and failing artes plague larger cities, but Princess Celestia has found a solution that she asks Twilight Sparkle to learn to tap into, so she can begin a New Power Initiative that will heal all of Equestria.
But there are heavy consequences for tapping into powers that ponies were not meant to have...

NOTICE: This is an unofficial and highly expanded story adaptation of the "PWaaMLPfim" Youtube Video Series: Phoenix Wright / My Little Pony FIM - Turnabout Storm! The videos came first, NOT this story!!!!

A quiet summer night in Ponyville takes a violent turn when two pegasus ponies enter the Everfree Forest and only one comes out alive, leaving the second accused of murder, on trial for her life. Ace Attorney Phoenix Wright finds himself dragged from his own world, magically summoned to Equestria by Twilight Sparkle to defend Rainbow Dash from charges of killing Ace Swift, a superstar pegasus athlete and champion racer.

Trapped in an unfamiliar world ruled by magical talking ponies, Phoenix must draw on all his wits and experience to solve the crime and uncover the conspiracy behind it... before Rainbow Dash is banished to the sun for a murder she didn't commit.

Parts 1-43 written by RavenRegios, and edited by Firesight. Parts 38, 42, and 44-epilogue written by Firesight with additional input and prereads from TheGoldCrow, AJ_Aficionado, and Leo Archon.

Ownership transferred to Firesight on 1/15/2018.

If there was one thing Twilight Sparkle had learned since ascending to alicornhood and becoming a princess, it was that ponies talked. Then, quite suddenly, they were talking about her.

And then they were talking about her love life since she was a single princess, unmarried and approachable.

She was still getting used to that part.

She was especially getting used to talking about it with Sunset.

5/14/2018: Now with cover art designed by the very generous Novel-Idea! Thank you so much!

Rarity is suffering from creative burnout, and Rainbow Dash decides to help by dragging her to a concert of her favorite band, Villian Court, led by one Twilight Sparkle. Things quickly spiral out of control in ways Rainbow couldn't have anticipated (but doesn't mind).

Have some Anthro RariTwi AU, because Earthsong apparently decided that I was not busy enough with my existing fics and tossed what she called the "Reverse Rockstar AU" (basically a role-flip of her Rockstar AU, where Rarity is a rockstar and then meets Twilight) onto my Tumblr dashboard. And I took one look at the picture and started to write.
Since then, we exchanged WIPs and ideas, and by now, her AU (now called the "Rock'n'Royal AU") and this fic are very similar, but also slightly different as we both worked on angles in different ways. It's been a wild ride so far, and I loved every minute of it!

Cover art done by Earthsong, which is fitting since she's the one who handed me this plotbunny to begin with. Fic title inspired by the song "Rock the Casbah" by The Clash.