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!

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.

Thorax is a junior processor, class Q, and has lived his entire life in the hive, yet he dreams of things bigger. Grander. Much more important than watching pH levels in vats all day. Wouldn't you know it, his application to the espionage services gets accepted, too! Maybe he really is going places!
Except he nearly flunked the exam, and knows nothing of the outside world. Regardless, Queen Chrysalis charges him with a very important mission: Spying on the inhabitants of Ponyville, especially Twilight Sparkle.
Nothing, of course, goes right after that.

Cover art by Chicmonster

After the invasion of Canterlot, ponies became aware of the frightening changeling race. As a result, they had adopted methods of exposing and countering the love-feeding parasites.

Glamour, like other changelings, have found it more challenging to find a stable supply of love. Seeing the flaws in posing as a pony's loved one, she tries a new way of getting love.

By becoming a fashion model.

All she had to do was become famous and bask in the adoration of her fans. However, the world of fashion is not as easy as it looks, and Glamour finds her life become much more complicated when she gets paired up with Manehattan's newest fashion designer, Coco Pommel.

First featured on 8/29/15

This story takes place a bit after the events of "Rarity Takes Manehattan".

This story is a sequel to Thrown Abroad

After the events of Thrown Abroad, Suncloak the changeling is happily living in Ponyville. Well, sort of. He needs the love of friendship to stay alive! Luckily, there's plenty of ponies who would want to be friends with him. But let's not forget about other changelings here...

You know, this would be a lot easier if the whole concept of friendship wasn't so needlessly difficult.

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Amazing cover art by Wolfeh! Find her Tumblr here!
Fanart!
To be found on Equestria Daily here!

In the wake of Chrysalis' failed invasion, a different hive breaks tradition and steps into the light to open relations with Equestria. The ever eager scholar, Twilight Sparkle, uses this truce as the perfect opportunity to learn more about this enigmatic race. Unfortunately, or maybe fortunately, she will learn all there is to know about what it means to be a changeling.

But will Twilight lose herself in the hive, or will she regain what she has lost? Only time will tell.

Featured on 9/24/13

My first featured story! You guys are awesome.

Story readings and cover art by Luminescent Skies: Click here for some audio novel treatment

My Editor in Chief: Cloud Hop

This story is a sequel to Of the Hive

Having fully embraced her new changeling heritage, Twilight Sparkle turns to the past to learn more about her people. A difficult task, given that every other queen cares next to nothing about it.

What she finds will shed unwanted light on a secret better left forgotten.

Editor in Chief: ABitterPill

Coverart: Tulip

This story is a sequel to Culling of the Hives

It's been twelve years since Twilight awakened as a changeling. With Phoenix Roost's focus on economic and population growth, the hive has grown strong.

The rest of the changeling hives have been ravaged by war for years with Twilight's brood remaining aloof. Sphinx psyker immigrants have dispersed throughout not only Equestria but as far as the Griffin and Minotaur nations, eager for a new life away from the paranoia of their homeland.

Yet for all of Twilight's desire for leave the rest of the queens to their wars, the Home Guard's proclamation will force Twilight to return to the jungle of her rebirth.

Real cover art pending.

As always, big thanks to Boldish42 and A Bitter Pill for editing.

This story is a sequel to Aegis of the Hive

Natural selection. It is the byword of every changeling queen who has ever lived. The chief resource that has always curbed the hives' growth used to be love. Now though, with Queen Twilight Sparkle's bloodline capable of producing love on their own, the old guard of changeling morality has seen fit to acquire this ability for the next generation before removing all of their future royal daughters' competitors.

Some queens are far closer to this goal than others.

Editor in Chief: A Bitter Pill, and Boldish42

Jessica finds herself flung into a world she has little concept of. Everything is strange and new to her, but worst of all she cannot communicate with the native inhabitants. A world of monsters and sapient ponies, griffons and other assorted beasts is no place for a human girl.

How will Jessica cope? Without an understanding of their language how will she make her way in the world, will she even be able to ever communicate with them? Why was she even brought into the world and is there even a way for her to get home?

(Thanks to Tulip for the Cover image!)

(Also now apparently has a Tv Tropes page in the making. )

Now has a re-telling in progress focusing on the Equestrians' side of things, A Stranger Among the Voices