MLP/Undertale crossover.
Not a PWNY-verse story.

Long ago, the Monsters and Humans fought a great war. The Monsters lost, and were sealed in the Underground. It would take the power of seven human souls to break the barrier that kept them imprisoned. They only had six. And so the Monsters waited and hoped, praying that another human would find their way to the Underground. Some thought the seventh soul would give their King the strength to break the barrier. Some dreamed of a human who would be their friend, and save them all...or had nightmares of one who would bring back the war.

...but nobody came.

...but somepony did.

Eons after the war, with no way to tell how much time had passed above, a tiny blue filly with wings and horn fell into the underground, calling for her Mama. None knew the poor creature's nature or origins...but her soul was powerful with magic, even more so than a human soul.

None can know what will come...of this little 'Woona'.

Cover art by Sanyo21

The following story takes place in the Equestria at War universe.

For some, the memory of the Great War against the Changelings was just that; a distant memory. But nopony can deny that, despite a victory, the repurcussions that followed have resulted in a dark time in the worlds history. God-Empress Daybreaker now rules across the Equestrian continent with an iron hoof, and has ruled uncontested for over two decades.

Even her protégé, Sunrise Sparkle, is starting to doubt her superiors' decisions. But given that nopony ever questions the God-Empress and lives to tell the tale, she simply kept her thoughts to herself. That is until a certain thought to be dead Princess of the Night visits her in a dream...

Cover art by Neither
Full size here

Staring at the sun makes you go blind.

Twilight's clone barely escaped her grisly end, and is seeking refuge in the large city of Manehattan. She's quite fine with going it alone, until she spots somepony just like her.

Inspired by the Cover Art by Badumsquish

Queen Chrysalis, against her better judgement, accepted Starlight's offer of redemption after her hive, and her plans, exploded around her. Now, the next day, she wants nothing more than to go on with her miserable life. Her children have other plans.

This takes place in the same universe as my alicorn Starlight story The Tiniest Changes, but can be read on its own perfectly comprehensibly.

I'm marking this as incomplete, because I suspect I will revisit it when I'm in the mood to write Chrysalis, but the first chapter was written, and functions, as a standalone story.

This story is a sequel to Petriculture

It's been several months since Pinkie Pie made a stunning admission about her past that permanently changed her relationship with her friends, particularly Twilight Sparkle, but life seems to have settled back to normal (well, normal by Pinkie Pie's standards, at least). However, when an old nemesis returns and ensnares Twilight in her influence, it's up to Pinkie to make things right.

This is the second story in The Petriculture Cycle. There is a TV Tropes Page for the entire Cycle here.

Cover image by Page Turner; "Princess Twilight" vector by Nianara.

In an effort to keep her mind occupied, Twilight Sparkle decides to delve once again into the grand mysteries of Pinkie Pie. This time, Twilight's focus is on her claims of growing up on a rock farm: like so many things related to Pinkie Pie, the idea that somepony could grow rocks as an agricultural product makes absolutely no sense. However, the investigation eventually leads Twilight to a rather... surprising discovery.

This is the first story in The Petriculture Cycle.

Artwork by Page Turner. Now with a TV Tropes page.

In Everfree Castle thousands of years in the past, Anon puts two very special fillies to bed.

A little one shot I wrote because I wanted more stories of filly Celestia and Luna.

Cover art is by julunis14. Derpibooru code is 3038164.

The Crusaders sometimes form conclusions and make decisions based on impulsivity and gut feelings rather than rational thought. So, when they meet Ponyville’s newest, specialty flower vendor—a young, quiet mare from Alemaneia named Schneeblume—Scootaloo immediately begins to suspect something… that behind her quiet exterior, that bright smile, and those kind eyes, she's hiding something sinister.

Well, technically, she is... but perhaps not in the manner they expected.

In the end, the three quickly-growing fillies may find that their cutie marks and their penchant for helping ponies may come in a different fashion than they're used to.

Cover art done by the incredibly talented G_Hyze. This is the crop of a full picture I commissioned; said picture is presented in the story and sourced to his DeviantArt.

Every morning, Princess Celestia wakes up in terrible pain, and every morning, she chooses to endure it. Until one blissful day grants her the blessing of feeling normal.

Few things in her life have ever frightened her so much.

6th-place winner in the /fic/ write-off "Look, I Can Explain..."

Featured on Equestria Daily!

Reading by Skijaramaz

Now translated into Russian.