Luna has a secret.

A secret that she's kept close to her heart ever since her return from the moon, a secret she's hidden for so long that she's no longer even sure if it's real. At least until it returns to haunt her, and she has no choice but to confide in Celestia and hope her sister trusts that she hasn't gone mad.

It's time to tell Celestia about the circles.

Strange symbols have started appearing all across Equestria that nopony can read, except Discord. As he comes to grips with what this message means, he is determined that nopony find out its secret. If they do, absolutely everypony in Equestria will die.

This story is a cosmological crossover with The Three Body Problem trilogy by Cixin Liu, and thus contains spoilers for that universe. But can be read without prior knowledge of that story.

Audiobook available on YouTube!
Featured on Equestria Daily!

Twilight has given you a new book to read. Well, she didn't exactly give it to you, you actually just found it in the back of the library. Behind a shelf. On the ground. It looks very old, downright ancient, and it smells like moss and rot. The binding is a little cracked, and there's no title on it. You can't help but wonder what might be inside, and the only way to find out is to keep reading.

Just turn the page.

You can do that much, can't you?

Please?

WARNING: This story contains brief depictions of blood, mild violence, and death, and has ARG aspects to it. It plays with formatting, and includes images. Some "pages" are long, some are only a few words. It is written in first person, to you, the reader, and is a slow mellow horror. You've been warned.

This story relies on unusual formatting for some parts, and thus may not be as enjoyable on a tablet or phone, or if you have specialized custom Fimfic settings.

If you post spoilers, hints, or answers in the comments, please be sure to spoiler them out or warn others. You don't want to ruin the fun, right?

Audio reading: https://www.youtube.com/watch?v=28TqbHFchLg

Bioshock meets MLP in this psychological thriller, where Celestia's new faithful student, Siren Song, must discover the truth behind the city beneath the waves.

Beautiful, gifted, and faithful student of the Princess of the Sun, Siren Song has very nearly everything a pony could want. Sometimes though, in the twilight hours, Siren can see the sadness in her mentor's eyes. Once, ponies whisper, the Princess had another student named Twilight Sparkle, but she left Equestria, never to return. The pony who has a perfect life just needs one more thing—to convince Twilight Sparkle to come home so the Princess will smile again. But when Siren arrives in pursuit of Twilight, she soon finds herself trapped in a city of horrors, with only its monstrous denizens for help.

Now with a TV Tropes page!

Daring Do cannot believe her luck when she is asked to help explore the most ancient tomb known to ponykind. But terrible danger awaits her, for beneath the earth rests something beyond equine understanding.

Warning: comments contain ending spoilers.

TVTropes page.
Alternate ending by Duplex Fields.
Archived in the Pony Fiction Vault.
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It's Princess Day! A happy day when little five year-old fillies and colts get to meet the Princess of Friendship and find out if they'll get their cutie mark extra-early.

Daylily can't wait to find out what happens to him.

It has been a year since I last saw her when she appeared on my doorstep, strangeness in her eyes and a mumbling under her voice.

She asked for my help to investigate a peculiar object, which once held an odd ancient magic. But it's benign now, she said.

It's benign now.

A hidden museum rests in the Canterlot palace, by law open to the public, by practice closed to visitors. Within its walls lie treasures of opal and gemstones, salt and wood. Shelves filled with untouched scrolls line the walls.

It is here that Luna pays her respects to Equestria's fallen heroes. Why, then, is it against her sister's wishes?

Twilight told me to write in this diary. She said it'd help me with anything I need to get off my mind. Well, I took her word for it!

This story is a sequel to The Diary of Spike the Dragon

Spike is on a mission. A mission to save himself and his 'friends' from everypony. He believes that Twilight and the others are falling into their clutches and he must stop them. What happens now? Innocent lives are gone, ponies panic, and our heroes have to decide between friendship and the lives of other ponies.