This story is a sequel to The Celestia Code

When the monsters created by the dark crystal engine escape their prison, it's up to Princess Twilight Sparkle to deal with them. She gets help and advice from Princess Luna, but things don't go as planned. In fact, when a pony who relies on logic and rationality tries to navigate the stormy seas of emotional entanglement while simultaneously saving Equestria from a horde of evil creatures intent on destroying everything they encounter, nothing goes as planned.
AUDIOBOOK by VisualPony
WARNING: Major spoilers in the comments.

Book 2 of the Alicorn Adventure series.

Goodreads Page
100% Approved by Twilight's Library!

The Badass Twilight tag applies more than ever, but please note the new tags.

This story is a fairly direct continuation of The Celestia Code. You might be able to follow it without having read The Celestia Code first, but it's better if you do.

The sequel is here: The Twilight Enigma

Most excellent pre-reading/editing done by the erudite AcademicPony and the dapper statoose!

This story is a sequel to The Luna Cypher

Twilight sets out to learn more of the ways of the world, and soon decides that the whole planet is disorganized, insanely dangerous, and desperately needs to be fixed. And she's just the mare to do it... with a little help from her friends.

Also, there are sky-pirates!

Book 3 of the Alicorn Adventure series.

A few extra, slice-o-life chapters are here: On the Rocks

Princess Twilight Sparkle discovers a centuries-old mystery hidden in the Royal Archives. Her investigation leads through layer after layer of deception and misdirection, setting her hooves on a path that seems to be leading to a mysterious secret. Along the way, she learns that some friendships can be very, very strange.

Book 1 of the Alicorn Adventure series.

AUDIOBOOK by VisualPony
Featured at the Royal Canterlot Library
TV Tropes Page (Courtesy of Sandtalon)
Goodreads Page (Courtesy of Facedeer)
Equestria Daily Page

WARNING: Major spoilers in the comments. Takes place several months after the end of season four. (Not a Da Vinci Code crossover, BTW!)

Do you see a dark tag? No, you don't. Not dark. Well, okay, there are a couple of dark-ish bits, but that's all. Not enough to warrant a tag. Speaking of tags, there really ought to be "Badass Twilight" and "Friendshipping" ones.

Sequels and side-stories (and more) can be found here Offprint and AO3, and a hardbound two-volume set of all that can be ordered from The Ministry of Image.

My editor for the first edition of this story was Gogito, and I can't thank him enough for all the hard work he did. My editor for the revised version was PresentPerfect, and he did a terrific job of getting the story into excellent shape.

This story is a sequel to The Cadenza Prophecies

Princess Flurry Heart inherited her mother's beauty and grace as well as her father's strength and bravery. The Empire couldn't hope for a better or more suitable heir to the Crystal Throne. Everypony in Equestria admires her and thinks she will be an ideal ruler.

They're wrong.

Young Flurry Heart has no interest at all in being a prim and proper princess, and would much rather have wild and dangerous adventures like her Aunt Twilight.

Book 5 of the Alicorn Adventure series.

Sweetie Belle is getting to be that age. She's thinking thoughts she never thought before. One such thought is about babies; Where exactly do they come from?

And why is it so difficult to find the answer to that question?

Rainbow Dash was the Iron Wing. She was a war hero, the Slayer of Shadows, the Liberator of the Crystal Empire, the Wrath of Celestia. And depending on who you ask, she still is.

But the war is over. There's little need for a pony like her in peacetime. So she keeps telling herself that she needs to adjust, that she needs to find a new role to fill in the world that she saved. But Equestria seems content to let her remain what she has become, even though they have no need of a warrior.

"This isn't how it's supposed to be", is something she keeps telling herself. But every time she says it, the only thing she can reply is, "so what should it be?"

One whole year after the close of the war, and Rainbow Dash still doesn't have the answer.

Art by NCMares.

This story is a sequel to Why No One Messes With Luna

Shepard has done the impossible. Old foes have set aside their differences, new friends have come into the fold, and the galaxy is more united than ever before. But the Reapers care not for the new alliances they face; they will fall, as countless civilizations before them fell. It is inevitable.

There is still hope. The Crucible, source of unimaginable power, has been constructed by the allies. With this new source of hope in tow, the allied fleets break through the Earth blockade and attempt to use this newfound weapon in a last, desperate attempt to defeat the Reapers and save the galaxy as we know it. Fleets of all races, soldiers of every kind, are united in this final stand.

Equestria, too, has sent what they can to aid in this final battle. Or rather, who, they can.

The Reapers have no idea what they have unleashed.

Warning: This story contains spoilers for ME3 and takes place during the ending of the series. This story is less approachable than the previous stories and may be confusing to those who are unfamiliar with the ME3 ending

Coverart is by Ziom05, on DeviantArt, and can be found here.

Twilight has a problem on her hooves. An hour before Celestia was supposed to come to Ponyville for the Summer Sun Celebration, she's accidentally gone and killed everyone dead. As in, "dead as a doornail" dead. Now she's got to fix it before Celestia shows up and finds out.

Or, at the very least, make sure that Celestia doesn't know that they're dead.

Blame Blueshift for this.
Now with a sequel!
Now with a reading, graciously provided by Skijarama!

Here I am in an afterlife, of sorts. But somewhere along the way, I lost a large chunk of my real life.

There’s only one being who could have reasonably pulled any of this off. There’s a problem, though. She doesn’t exist.

Yet.

Written for the December 2016 Writeoffs, where it placed sixteenth. Caution is advised.

This story is very non-canon Optimalverse, and should therefore be approached with even further caution.

Note the self insert tag. Blatant wish fulfillment ahead. Did I mention caution?

They came suddenly and without warning. They wanted us to boop them. We must resist.

The art is by neuro if anyone was wondering.