This story is a sequel to The Twilight Enigma

With the queen of Twilight Town present, the Storm King's invasion of Canterlot goes badly for his commander and minions. Not satisfied with a mere victory, Captain Blackmane and her friends go on the hunt. Twilight is determined to find the Storm King and make sure he will never be able to harm anyone ever again. It's obviously a mission of reasonable prevention, not murderous revenge. Obviously... Right?

Book 4 of the Alicorn Adventure series.
Sequel to The Twilight Enigma and prequel to The Skyla Pseudonym.

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

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.

Twilight did her duty. She saved everypony she could, except herself. Now trapped by an evil cult, in more pain than she has even been in before, and dying on a sacrificial altar, she calls for help. The Nightmare answers.

Will Twilight become the next evil to threaten the world or will the Nightmare simply be glad to have some freedom? One thing is for certain, Twilight's life will never be the same again.

The Editors
Cander (CH 1-Current)
Yutah123 (CH 8-9)

Now with an excellent reading by StraightToThePointStudio (Currently only up to CH 30)

And we even have art!
[Warning Spoilers] Twilight's Nightmare Art

I got dragged to Equestria by pure accident due to an experiment gone 'wrong', roughly forty years before Nightmare Moons' arrival.
No matter what I do, as a pony-changeling hybrid, something will change with Equestria. I just hope I don't doom the country before Nightmare Moon even arrives... Or worse.

This is the first story I ever tried to write professionally, so there WILL be errors, for that, I apologize in advance.
I'm editing and proofreading it on my own because I literally suck when it comes to using this site competently.
Lastly, I am a slow writer due to IRL getting in the way but I will try my hardest to settle the story down whether it's popular or not.

Fair warning, there may be spoilers in the comments.

Thank you to Little Tigress for the fantastic cover art.