One night a year, on the Eve of the Summer Sun Celebration, Princess Celestia is sad, at least according to Twilight's observations. She has a plan, a boardgame, and is determined to try to cheer up her mentor.

No clop, but suggestive content.

What does it mean to be Celestia? What does it mean to be "at the top"?

Celestia knows.

And soon, Twilight will too.

Now on Equestria Daily!

Winner of the Second Twilestia Contest.

Now in Russian! Courtesy of Nogood.

It started with a letter from Spike.

"Twilight in trouble. Send help!"

Everything has gone wrong. Sombra should never have been so powerful, he was only a shadow of his former self—it was the perfect test for Twilight! Luna had questioned her judgement but she’d been so sure, and now everything has gone horribly, horribly wrong.

AU ending to the Crystal Empire Part 2.

Given the successful befriending of Discord, Princess Celestia deems that no longer will villains be defeated but instead reformed. While most have the chance to submit willingly or continue to fight, King Sombra is given little option. Brought back from the dead and stripped of all his powers and strength, it's all become a game of futility. Now Sombra only wishes he could have stayed dead all along.

Edited by spigo.

"I stood before the doors to Princess Celestia’s private chambers, just as I had so many times before, and waited. I’ve always been a nervous mare before our meetings, wondering if what I had done measured up to her expectations. But I had never before entered those rooms with the blood of another being on my hooves. I swallowed, dreading what I would discover behind those doors."

Twilight faces more than she bargained for when a resort island turns out very different from her expectations, and she must make a decision that will forever change how she sees herself.

Everyone has their secrets. Everyone has their regrets. Everyone has made their mistakes, both small and large. Everyone has something that they simply want to forget. Something that they want to hide.

Always the curious one, Twilight discovers the hard way that certain things are hidden for a reason.

Sometimes, bad things happen to good ponies. A year following a tragic incident, Twilight Sparkle returns to Ponyville to visit what she has been missing - her town, her memories, and most importantly, her friends. But will everything be as she remembers it?

This story has a sequel titled "In History, Maybe".

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

Celestia discovers a lingering trace of Nightmare Moon's soul still lodged in Twilight's mind—a survivor of the lingering effects of the Element's magic.

Faced with the threat of gradually losing her friend to Nightmare Moon's evil influence, Celestia realizes the only way to save Twilight is to let the storm of dark magic take its course all at once.

And yet, as Nightmare Moon's corrupting magic tears away at Twilight's forgiveness and understanding, and Twilight begins dredging up unexpressed doubts once kept controlled, Celestia must face a lifetime of confrontation her student has kept covered.

It is going to be a long night for both alicorns.

This story was written for the Tenth Bimonthly Twilestia Contest. It placed somewhere.

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!