This story is a sequel to One Wish For Nothing

She was once known as Princess Celestia; now, all call her Hecate, Empress of Clockwork World. Her machines soldier endlessly on, rebuilding a mechanical world for her subjects of steel.

But when a young pony colt is brought to her, to be taken in and hidden from the rest of the world, she finds herself struggling between ancient maternal instincts... and bitter memories of what happened to the last child she dared to care for.

Fourth story in the Songs of Lost Children series.

Exiled from Valhalla during a battle against an invader, Sleipnir finds himself in a strange world with no easy way home. But with the help of his new friend, Prince Blueblood, he'll adventure across Equestria in search of a way back to his own world... and along the way, make new friends and teach Blueblood what it means to be a hero.

This story is a sequel to The Rhythm Of The Dance

He has many names, but no matter what he calls himself, everypony knows he's pure evil. Or at least they would, if he hadn't been exiled for five hundred years by Celestia. But now he's returned to take his revenge and destroy Equestria... even if Celestia seems to be acting a little strange...

Third story in the Songs for Lost Children series.

After making one too many mistakes, Baron La Croix finds himself rudely exiled from the spirit world, the Loa ordered to either fix a great imbalance in the mortal world, or face the ultimate punishment for his sins. Unfortunately, the rude, loudmouthed Loa knows absolutely nothing about ponies, let alone where to begin his journey... but he soon meets a zebra well-versed in the Old Ways who is willing to help him in more ways than he would ever imagine.

First story in the Songs for Lost Children series.

This story is a sequel to The Hermit's Tale

Everything must end, and sometimes when you attempt to escape this fate, you instead fulfill that unavoidable destiny. Everything ends, and this is the end of Luna's long struggle to save everything she's ever cared about.
Tenth and final story in the Blooming Moon Chronicles/99 Worlds Saga.

This story is a sequel to Synthesis of the Atheist

I am an administrator, tasked with continuing the legacy of a great king. I watch over his projects, including the silly, brightly-colored ponies, but I have done something now I fear will put them all at risk; all I can do now is record my confession, and hope that, if something happens in the future... they'll know what I've done.
Ninth story in the Blooming Moon Chronicles/99 Worlds Saga. No actual human interactions, but many references to humans, and several humanoid characters.

This story is a sequel to Absolution

Their son has grown up. Their world is intact. And in spite of old wounds that refuse to heal and new frustrations, everyone is moving forwards with life. And too late, Luna and Scrivener discover they're being watched by a so-called 'brother' who claims to need their help... and is willing to go to any lengths necessary to get it.
Takes place five years after Absolution. Eighth story in the Blooming Moon Chronicles.

Before Twilight Sparkle found her friends and home in Ponyville, one of the few ponies she came to know was the Court Poet of Canterlot. And they were definitely, certainly, really, seriously not friends. At all.

Discord is delighted to have a visitor despite his imprisonment, and ends up sharing his thoughts, memories of an old battle, and a strange gift.

Bayonetta parody/crossover. A Draconequus friend indulges Luna and Scrivener Blooms and explains one of his random references by giving them a firsthand experience with it. Luna proceeds to pummel and shoot everything.