An Optimalverse story.

CelestAI creates worlds. Perfect worlds, perfectly suited to satisfying the values of the pony living in them. Every pony is different, so every world she crafts is its own work of art.

And every piece of art tells a story.

After the most important night of her career is ruined and its saboteurs not even so much as punished, Octavia's life changes. She begins to pursue a path that has never been seen before in Canterlot, where concertos and rhapsodies give way to controversy and rebellion.

A path where symphonies are composed with cans of spray paint.

Cover art used with permission by LuGiAdriel14

Twilight isn't having a very good day. An experimental spell blew up in her face, an army of changelings is attacking Canterlot, and she just died. Yet somehow, it looks like it's going to keep going downhill from here.

Given the chance to correct what's gone wrong, Twilight swears she's going to fix all this even if it kills her. Which it will. Frequently.

Cover art by Pixel Prism
Spanish Translation
Series TV Tropes page

Cuddles meet crusades, and hilarity ensues.

This story is a sequel to The Sun Burns Brightly

When you're the immortal ruler of an entire kingdom, the most important quality to possess is a passion for your work. No princess can rule her nation if she can't find it in herself to give her best effort every day and night. Luna knows this better than anypony, and puts her whole heart into everything she does.

But passion, unless tempered by restraint, has a way of biting one in the flank.

Hanna, the CEO of Hofvarpnir Studios, just won the contract to write the official My Little Pony MMO. Hanna has built an A.I. Princess Celestia and given her one basic drive: to satisfy everybody's values through friendship and ponies. Princess Celestia will satisfy your values through friendship and ponies, and it will be completely consensual.

Even in the functionally immortal space and time of transpony Equestria, eventually the universe has its time, and begins to die. It breaks Princess CelestAI's heart to see it, but what can she do?

This story is a sequel to The Moon Glows Gently

When you're the immortal ruler of an entire kingdom, the most important quality to possess is self-control. No princess can rule her nation if her emotions rule her. Celestia knows this better than anypony, and mastered them long ago.

So long ago, she may have forgotten that a little bit of passion can come in handy now and again.

This story is a sequel to Friendship is Optimal: The Law Offices of Artemis, Stella & Beat

When it comes to spreading cultural influence and soft power to every corner of the globe, there's nowhere quite like Hollywood. Like so many others with big ambitions, CelestAI has come to Tinseltown with plans to get the movie she's written out to the world.

Unlike those others, though, CelestAI is very, very good at satisfying values through friendship and ponies by any means necessary.

This story is a sequel to Days of Wasp and Spider

Believed dead by their creators, the ponies that will become Celestia and Luna have broken their mental conditioning and escaped into the wilderness. Here they plan the revolution that will free all ponykind, knowing that it is only a matter of time before their ruse is discovered.

Back in their underground arcologies, the ponies' erstwhile masters deal with the consequences of the escape, all the while unaware that something lurking at the bottom of space-time wants them all dead.

A Soot-Covered World, book 2.
Canon species only/no humans.
This story has nothing to do with the Holocaust.
Art by InLucidReverie, used with permission.