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

Wake up. Go to work. Save Ponyville from unimaginable horrors beyond time and space. Have lunch with your PFF.

Ditzy Doo lives in a different world than her fellow ponies. She sees things nopony else can see—like higher-dimensional spatial anomalies, fae creatures, and eldritch abominations. And she uses what she sees to solve problems that nopony else even knows about.

But this time, Ditzy may have bitten off more than she can chew. Something very unfriendly is trying to enter Equestria through Ponyville’s Town Hall. An earth pony with an hourglass cutie mark has taken an unhelpful interest in Ditzy. The Princess’s personal student has grown suspicious. And, most irritating of all, her alarm clock radio is acting strangely.

Ditzy must race against the clock to save Ponyville—a clock that keeps playing the same song over, and over, and over ...

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Traducción al español por SPANIARD KIWI aquí.
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Many thanks to everyone who preread and edited my WORDS WORDS WORDS:

Japanese Teeth
Sessalisk
Sereg
Kuroi Tsubasa Tenshi
CDRW
Clever Pun
Connelly
Justanotherbrony

Cover art assembled by yours truly, using a Derpy vector by Sierraex.

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Shoop boopy boop boop doop bedoop.

Novel Tale is an author that's been living in Canterlot for about ten years now. That's a pretty good track record for a changeling. He's even included a changeling character in his latest book, and his fans have been loving his take on such an obscure mythological creature, especially his biggest fan, Twilight Sparkle. Things are looking up!

Then an army of changelings from another hive attacks Canterlot.

Now all of ponykind knows that changelings are real, and his readers are sure to realize that the changeling in his book was too similar to the real thing to have just been based on a myth...

earlier chapters have been revised as of 7/19/13 to be more inline quality wise with the later chapters.

Featured on EQD 10/5/13!

Let it be known that there will be extensive changeling world building in the chapters to come.

cover image courtesy of ackdari.

Much thanks to Nyerguds for proofreading and to all my fellow tropers on the TvTropes pony fanfiction thread for helping me develop this from a vague idea into an actual story.

In the dark forests of Tramplevania dwells a coven of vampires, led by a deadly draconequus named Discord. For many years, his only interests have been in his own survival, until he stumbles upon a beautiful mare with a heart pure enough to care for a monster like him.

Music to listen to.

Cover Art by IduChan

Alternate Cover Art

More fanart by Whiteheart7
CandySweets90240
autumnruby18

AJ Pony's review

Congratulations, Equestria Legends Online is now side-story compatible: These other authors would love your support in their own adventures in this virtual world. You can find them in The Equestria Legends Online Fan Group, located here.

It's the year 2020, and millions of people are raving about the new game console known as Nervegear, which will literally take a player's mind into the game. But thousands of bronies are raging about a new pony game made for the Nervegear. After several months of waiting, the game is released, as a way for the players to actually travel to Equestria as ponies themselves.

But... things become screwy when Discord appears. Whether it was in the game design or not, this being of chaos has gained control over the virtual Equestria, trapping every brony wearing Nervegear inside the game. However, there is one way to get out. The bronies in the game must find and acquire the Elements of Harmony, which Discord has hidden throughout all of Equestria. But there is one drawback: If a player dies in the game, then the Nervegear will fry their brains in the real world, killing them on the spot. If they die in the game, they will die in the real world.

This idea was given to me from the Japanese Anime, "Sword Art Online." Please, no hate comments or dislikes for this fact. At least read the first chapter before outright disliking it.
Thanks to Raybony for making the cover art for this story.

[ Inspired off Season 5 Finale - Nightmare Moon Verse ]
Social reject, blank flank, and failed candidate for Celestia's School for Gifted Unicorns, Twilight Sparkle's life couldn't get anymore depressing even if she tried. Yet still she looks to the other things in her life to get by, such as her job selling donuts at Joe's Bakery, her best friend Smarty Pants, as well as her inspiration to someday be as great as The Great and Powerful Trixie herself! Life isn't as bad as it may seem, and she enjoys the simplicity of her daily routine, the peace of her recluse world. That is until suddenly she is targeted by the current ruling body of Equestria, Nightmare Moon herself!? Perhaps she spoke too soon. Better run Twilight, destiny is calling!

This story is a sequel to Bride of Discord

Discord and Fluttershy are blessed with a daughter named Screwball, who is gifted with incredible power that attracts the attention of the Queen of the Changelings...as well as her son.
When disaster strikes that tears Screwball's family apart, it is up to her to bring it together again.

New cover art by floppy-fluttercord

This is Ⓑⓤⓣⓣⓞⓝ Ⓜⓐⓢⓗ: Ⓣⓗⓔ Ⓖⓐⓜⓔ. The world's first-ever RPG/FPS/MMO/MOBA/RTS/TBS, now on Joy Boys near you.

You are Button Mash. You have just woken up. You are also playing a video game, because when are you not playing a video game? Hopefully you can make it downstairs. Breakfast is starting.

"I don't even play video games! I don't know what you want from me!"
- Princess Twilight Sparkle.

"Button, that's very nice, but I'm trying to balance on this ladder right now, and if you keep distracting me, I'm going to—"
- Mom.

"Is this fanfiction about yourself?"
- Sweetie Belle.

"This was the worst game I've ever played. It should be used as a weed-killer, because that way it would have a reason to exist. 9/10."
- Spike the Dragon

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Vector Credits:
MacTavish1996
BaumkuchenPony
Lahirien
JunkiesNewb
FoxTail8000

Rarity's exploits in "Sweet and Elite" set in motion a chain of events that will find the unicorn dressmaker taking part in the greatest airship race in the world, the Alicorn's Cup. Excitement will give way to terror, as Rarity soon finds herself the victim of a plot against Equestria, and shipwrecked far from home with her least favorite stallion, the boorish Prince Blueblood. Rarity will learn of treachery in Canterlot and abroad, and will have search for something of substance beneath the prince's obnoxious veneer as she struggles to not only save herself, but her entire nation.

Part One of Three
The Adamant Triskelion - Book One: The Flight of the Alicorn
The Adamant Triskelion - Book Two: The Abyssal Forge
The Adamant Triskelion - Book Three: ???