It shouldn't have been a big deal. Celestia was kidnapped or knocked out or just generally made to seem powerless by whatever idiot with ill intent decided to show up on a nearly weekly basis. As the mighty and immortal Sun Princess, she could escape at any time, but she was happy to play these little games. The daring rescues and bloodless battles gave her ponies such a sense of confidence and purpose!
But this one didn't go as planned. One small, stupid mistake got her thrown to the twisted reaches of the world-prison, Tartarus. Now alone, unarmed, and barely more than mortal, Celestia wakes in a living landscape where everything has every reason to hate her.
And, far worse, she has accidentally picked up a passenger.

Sidenote: This a repost (I tried to go through official channels, I promise!) of a story I wrote long, long ago on an account I foolishly deleted. Back in those days, Tartarus hadn't shown up in an actual episode yet. It's not exactly an alternate universe situation, but it has nothing to do with the canon portrayal of the place.

Super amazing cover art by Cold In Gardez.

Canterlot Castle's Royal Guards haven't had the best track record when it came to doing their jobs as Canterlot's defenders. This hasn't gone unnoticed by Princess Celestia and Princess Luna.

When the sisters pondered the reason for their guards' ineffectiveness, Luna concluded that Celestia's motherly nature toward her guards – as well as all her ponies – had prevented her from ensuring they received the proper training. Therefore Luna volunteered to personally turn the guards into buff, mean, fighting machines.

That is, if the guards could survive what the Princess of the Night had in store for them.

With time short and a life on the line, Twilight goes to a forgotten corner of town seeking out an urban legend in the desperate hope it can help her. What she finds is all that she expected and more. A creature of darkness that offers favors for blood. But first it wants to know how Twilight found it, and why.

In the process, Twilight learns a valuable lesson. It's frightening enough to know that supernatural creatures actually exist, but what is truly terrifying is when those creatures know you exist. And one of them takes an interest in you.

Pre-read by RTStephens and TheAlbinocorn. Cover art by S-I-REN

The neighboring kingdom of Aurora lays to the north of Equestria has always been reclusive. Much like there Queen Eventide, even through there generations of isolationism the diarchy of Equestria has always tried to form relations to no avail.
Queen Eventide had always respectfully decline the many invitations sent by Celestia. Mandatory meeting of the kingdoms was always visited by a trusted representative, and dispatching hardly sincere apologies as she declined to attend the celebrations. Yet to the princesses surprise the queen accepted to attend this years Grand Galloping Gala, why now of all celebrations?
Eventide, the queen, is a unicorn. As was her husband, King Astrid, who has sadly passed. And she to will pass on one day. The royal pony sisters had always wondered why she had not chosen a heir to assend to the throne on the day of her passing. But they didn't know of her only child, her heir. One who had wished to see the Equestrian capital city of Canterlot. The princess of the Aurorian throne, alicorn heir to her mother. Princess Twilight Aurora Sparkle, child of Queen Eventide

_______________________
(This story is inspired and continued from the original story by Meowofy. The Young Alicorn)
(In this AU, princess Luna Never became Nightmare moon. Celestia never took a student.)
(Lastly, this is my first long haul story I plan on publishing. There will likely be mistakes, I am open to constructive criticism. Let me know of any problems you find)

Twilight the Wise, Celestia the Bright, Luna the Dark, Cadance the Beloved, Chrysalis the Dreamwalker; the Princesses of Old vanished ages ago, and their power was taken with them. With their guidance gone society has fallen into disarray, and the absence of their magic is beginning to tear the world apart. Starlit Sky is a humble pony, doing what she can to provide for her daughter and live in peace. But fate would have other plans for her, as she is contacted by a mysterious stranger and tasked with bringing the old princesses home to their ancient seat of Canterlot so that they might bring peace and prosperity back to their kingdom.

Cover and Chapter Art credit to romus91 on DeviantArt

The world has been dying for as long as the Enchantress can remember, reduced to little more than a desolate expanse of sand. And yet, she keeps walking, for she knows she is the last hope of the world.

When mares from extremely different worlds arrive in her desert, the Enchantress is forced to reexamine everything she thought to be true. There will be stories of monsters, books, ghosts, gods, stars, machines, and ponies who have not lived most of their life in a world approaching the end. They must come to terms with their vastly different experiences in a tangle of alternate worlds no one is prepared for.

The multiverse is a big place, and this small corner of existence has just received some unwanted attention.

Cover drawn by Little Duke!

-GM, master of ashes.

That Prince Blueblood treats mares terribly. Luna takes matters into her own hoof to teach him a lesson, but it is she that learns something instead.

Tags: tg, trans, self identity.

When Twilight is stolen from her home, fate intervenes and brings her straight to her destiny. After growing up sheltered and loved by the spirits of the Tree of Harmony, Twilight will grow into her place in Equestria like never before while she searches for the family that raised her and gets to know the one she's lost.

(Unapologetically OP Twilight, if you’re going to nitpick that point then you are welcome to leave at any time.)

It's been many a year since Twilight took the throne of Equestria, and even though she's retired and is living happily in Silver Shoals, Celestia can't shake the feeling that something is off. That something is missing from her life. Facing conflicted feelings, she travels back to Canterlot to see how her former student is doing ruling Equestria in her and Luna's stead.

Little does she realize that this visit will be one that leads to much change in both her life, and that of Twilight Sparkle.

My entry in the The Twelfth Bimonthly Twilestia Contest

This story is a sequel to The Monster in the Twilight

Now that Luna has returned to the throne, and the aftermath of her brief appearance as Nightmare Moon is being cleaned up, the story is over. Right?

Not quite.

Twilight Sparkle had nearly been destroyed in the chaos of Nightmare Moon’s return, but now with the assistance of her five friends, she is facing a fascinating new world filled with wonderful things. No longer the scarred monster who nearly destroyed Canterlot and raged through the Everfree Forest for over a decade, now she has been healed by the Elements of Harmony and is living at the edge of town with her adoptive mother Zecora. Not all the fears of her past can be left behind that easily though, and now she must face the consequences of her actions as she faces the most daunting challenge of her life.

Ponyville.

Letters is a sequel to the alternate universe story The Monster in the Twilight. In this story, Twilight Sparkle exchanges letters with Princess Luna, two ponies with a common problem of fitting in and making friends after the destruction of Nightmare Moon.

Normally I would try to talk you into reading the sequel even if you haven’t read the original story, but in this case, you’ll probably be more confused than entertained. But go ahead. I don’t mind if you don’t read the first story. You’ll never find out what an Urlock is, but that’s fine. It’s your funeral.

Editing Assistance by Alicorn Priest, Peter and Tek

Credit for the incredible picture All Night Study Group goes to Bibliodragon at Deviantart

Physical books are available on Lulu.com (up to Chapter 82)
Letters From a Little Princess Monster (Paperback) 726 pages
Letters From a Little Princess Monster (Massive Hardback) 780 pages