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!

Twilight prepares for the most important night of her life. But it doens't go exactly as she had wanted...

Story was inspired by SolFoe's Study Interruption

After working the day away, Twilight decides that she wants to have fun. What better fun than by playing a prank on Princess Luna? Armed with her sticky notes and quill, Twilight is ready to start a prank war.

Twi x Luna shipping story.

This story is a sequel to Princess Twilight Sparkle's 500th Birthday

Five years have passed since the events of that fateful morning. Smarty Pants and her friends set off on an adventure of a lifetime to discover the secrets of the past when they awaken a… oh wait, that would be spoiling it!

Many questions from the first story will be answered! New questions will arise. Lunch will be had, pies will be thrown, blood will be kept inside bodies because seriously, ew blood, you guys.

Notes:
- Cover art commissioned by HAK2. Check out his other stuff, too.
- This is a story in the Birthdayverse.
- This story was written and completed (except for the epilogue) before Season 4 of MLP:FiM aired.
- Many thanks to my faithful Pre-Reader and all around super-duper best pony, Blood Lord go read his story, too!

To please her subjects, or at least not scare the flank of them, Princess Luna has decided to seek therapy. That and she has many problems she hasn't spoken about in over a thousand years. that's a lot of accumulated stress.

Inspired by Biker_Dash

Twilight is dying and she knows it. On her final night, she makes her way to the balcony atop her Canterlot suite and shares her final moments with her wife, Luna. The Princess then recounts the events leading up to her and Twilight's eventual marriage and life together.

Sunsets, they are full of color and are the very symbol of romance. But, as all beautiful things, they have a darker, sadder side to them. Because to some, they do not bring happiness and joy, they bring mourn.

Twilight Sparkle has been serving her country as the Princess of Friendship for over two years, and she thinks that it's finally time for her to take the next step in her royal career: she wants a fancy enchanted mane, just like Celestia and Luna. Luckily for her, the process behind it is pretty simple—all she has to do is go petition the legendary Author of All Beings. You know, the one that lives near the supermarket. Surely she'll be willing to grant Twilight her new magical princess mane!

Unfortunately for her, there's one catch: the Author of All Beings is a complete troll.

Thanks to ZuTheSkunk for the Faust vector. Thanks to Thornwing, Quill Scratch, Frog Myre, Manaphy, Oroboro, and Foehn for prereading.

Twilight becomes alicorn of the stars. This is sort of a problem, because Luna kind of already was alicorn of the stars. Oops!

TV Tropes

We all wear a mask called composure, beneath which hides a heart that twists with guilt and hidden feelings. Regal as she is, Princess Celestia is no exception. What might be revealed should circumstances cause this mask to slip - or break?

Set several years after the potential conclusion to the series.