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

Rainbow discovers that she has a pest problem in her house. The pest turns out to be both cuter and more annoying than she expected.

A winner of the 2015 Bat Pony writing contest.

Russian translation by KoylanGOLD
Also read: The Most Annoying House Guest

This takes place right after the events of Twilight Princess, and the defeat of Ganondorf. A new evil has risen in Hyrule. Once again, Link is going to save Hyrule once again. However, Link is suddenly transported to this new world called "Equestria."and meets colorful ponies.

Disclaimer: I don't own the Legend of Zelda franchise, or characters. Rights for Zelda go to Nintendo. Rights for My Little Pony go to Hasbro

When Discord escapes from Dysart Asylum on Hearth's Warming Eve, it's up to Mare-Do-Well and Draco the Dragon Wonder to stop him and save the holiday. Based off of the "Christmas with the Joker" episode of Batman: The Animated Series.

A breakfast conversation between the princesses turns toward Celestia's long history of losing fights.

A rainy night at a bar really brings out stories from within ponies. During a game of poker, Equestria's rogue list, including Nightmare Moon, Chrysalis, Discord, and Sombra, plus another, the baddies start sharing stories. The similarity; the telling of how they almost won their most famous defeats.

Loosely based on the episode, "Almost Got 'Em" from Batman the Animated Series

It wasn't too long after the fight. It took everything she had to stop him but in the end nothing short of a miracle truly helped her.... and yet she couldn't help but feel that she could've done.... MORE. Now she seeks to rectify her mistake. But first.... she has to visit a few friends first.

A One-Shot done with help from Rated Ponystar. Thanks you wonderful bastard you.

Edit: ON THE POPULAR PAGES 1/11/2016! THANK YOU ALL YOU WONDERFUL PEOPLE!

This story is a sequel to Sunset Shimmer: The Mysterious Mare-Do-Well

It is Hearth's Warming Eve in Ponyville, and the town is celebrating. Sunset Shimmer is at a party with her friends when she spots a suspicious figure leaping across the rooftops of Ponyville. Donning her Mare-Do-Well costume, she goes out to investigate, but not before Rarity offers to give the heroine a festive makeover for the occasion.

A one-shot companion story to "Sunset Shimmer: The Mysterious Mare-Do-Well." Reading the original story can give insight as to how Sunset arrived in Ponyville and became the Mysterious Mare-Do-Well; however, since this one-shot doesn't contain spoilers for the main plotline, it is not required.

Special thanks to my proofreader, professorsawyer!

When Rarity is overwhelmed with making designs for an agriculture exhibition, she turns to Applejack for advice. But when she gives Applejack a hair style treatment in return, the apple farmer lets her accent slip from southern drawl to sophisticated Manehattenite. The result? More fancy parties than you can shake a candy apple at!

Now with an audio reading by Skijarama!

Now with a print version available for order!

A purple Alicorn shows up one night and then vanishes into thin air. Many wouldn't think anything of it besides how strange it was.

Not Rainbow Dash.

Rainbow Dash has met that Alicorn before.

The implication it brings and the guilt that follows leaves Rainbow Dash with questions weighing on her mind.

Luckily, in the crushing pain of reality, she still has friends.

***

Cover art created by the extremely talented invertigo and paid for by the amazingly awesome Shipmun. Oh my gosh it's just so cool.