Undertaleau Stories

Imagine a world where the player doesn't exist. And that is the exact representation of this AU. No genocide, no eighth human, no player. All the monsters including the...

(I apologize in advance for my bad English, but I'm from Poland and I just learning. -u-) Cruel Story is the story of Cruel, a skeletal teenager who struggles with a cer...

What if there was an anomaly in the Underground? No, not Frisk. Not Chara either. Someone else entirely. How could a few measly children stand to this supposedly immorta...

A enemies to lovers errorxink classic. I will add side ships, but right now they are still being considered. If you want to suggest your ship, just comment what ship in...

I know I just made another story but this idea came to me in my sleep. #cringepun This is a Slumbertale Sans x OC story. Sadly, I don't have any pictures of my OC other...

The debut of the AmethysTale au! Hope you like it! I am a new author, so don't judge me if it's dirtcrap.

Just as the title says. Ask and dare our kidnapped- I mean honored guests as they arrive in a white empty void. Each chapter will have someone new to join in the asks an...

*INSPIRED BY "Your Friendly Witch" ON AO3* ~ALSO POSTED ON QUOTEV~ You are the daughter of Cupid, which means you must go to the mortal realm to help humans fi...

This Au start with a skeleton who has a special hidden magic that no other monsters in his Au have ever seen he named himself as "Sans" but in other sanses fro...

(UPDATES EVERY FRIDAY) NIGHTMARE is a sadistic bastard, that's just a fact. His goal is to corrupt Dream's soul and prevent the Doodlesphere from feeling positive emotio...

A human named Frisk wakes up in a mysterious place called the Underground and goes on an adventure to save the Monster Kingdom from the tyranny of Mettaton.

Hello Hello! I want to make more of this ship since I only do it ;w; also this is a new account and I want to make an actual story/fanfic about Shattered x Ink 🖤💛 hope...

(Temp cover, made by shadowy_suitcase_herring_neck on Tumblr!) They died together, in the derelict ruins of an abandoned pizzeria flooded with wandering spirits. Yet i...

This is a story of a world filled with Humans and Hybrid animals with 9 main souls to protect the universe. One day, A creature called the fear of darkness destroyed hal...

Short stories of my favorite Sanscest ships. Most stories will be soft and vanilla. If a story will have sexual themes I will leave an NSFW warning on the chapter but it...

Hundreds of years ago, monsters and humans both lived on the surface. The relationship was unstable, and it was no surprise when war broke out between the races. Monster...

discontinued for now. ───𝗜𝗡 𝗪𝗛𝗜𝗖𝗛, you read different short and quick scenarios of characters from undertale, deltarune & even the alternative universes or timeli...

She didn't really expected this, just a few seconds ago she was protecting her kids and now she's staring at a bunch of skeletons and a human with two of them looking a...

One month before Frisk falls into the Underground a different human falls, someone that is not from this world, but from ours, and now they have the power to change the...

Hello! This is the book made specifically for Wattpad about my Oc's...I shall warn you if you intend to read this; it's incredibly long and very descriptive. :'D And I r...