Sans is putting himself through hell - not knowing that there's someone out there who wants to save him. Based on the Dusttale AU.

"Long ago, two races ruled over Earth: Humans and Monsters." One race feared for their strong souls, the other for their magic, and the mages caught between them feared for both. All silently knew that war would be inevitable. The only thing that mattered was surviving it. One crimson mage understands that well, and is determined to keep herself and those she cares for alive.

After thousands of resets, Frisk succeeded in doing what everyone, including Sans, thought impossible: bringing back the lost prince and destroying the loop that was causing them so much suffering. Two years later, now an ambassador, he seeks to restore human-monster relation, while fighting against an evil that seems to be spreading in Ebott and threatening his new family.

[Horrortale AU] After their fight against Omega Flowey, Frisk left the Underground to get help and save their friends. Unfortunately, humans are not as comprehensive as monterkind and they didn't believe them. How to change their mind ? In the Underground, the situation is getting worse. Toriel and Undyne are fighting for the throne, and chaos is taking place in the Kingdom.

At the end of the war, monsters don't have the choice : they have to join Mont Ebott for survive another day. Sans and Papyrus, forced to run away after the attack of their village, are delivered to the horror of the war without any help and this one objective. But as sons of the royal scientist, W.D Gaster, they are an easy target. Both of them start a dangerous journey.

With a quick use of Sans' magic, we had returned to our home on the surface. The lovely three-story home sat quietly among the trees under the moonlight. Sans always loved to teleport just outside the door and glance at it before walking in. He was a little less lazy since coming to the surface. So much to learn. So much to do. So much to love. SEQUEL TO "TWO WORLDS, TWO SOULS"

What if two humans were in the Underground at once? What if one human was DETERMINED to stop the other? What if they could both SAVE? What happens when an Unstoppable Force meets an Immovable Object? When a certain scientist pulls enough of himself together, he finally finds a way to stop the destruction of his world. (Undertale AU. Rewrite of DT.)

"My name is Asriel Dreemurr. Six years have passed, and we made it to the Surface. But the world around us is much more dangerous and complex than we initially thought. To reach true reconcilation between Humans and Monsters, we need to help improve the hurt world around us. It will be a difficult struggle for me and my loved ones...but it will all be worth it in the end."

The power to reset the timeline, and the determination to move forward no matter what the cost. These are the two things that keep a young girl moving forward in the mysterious world of the underground. She could be the key to their salvation, but would it all be worth it? Especially if the one person that matters most remains trapped and alone. (I don't own Undertale.)

After getting to the surface countless times Frisk finally decided to tell Sans and Alphys what would inevitably happen, though that's when a desperate plan was suggested. If one soul isn't powerful enough to stop the resets, then maybe three will be. The only question is, how can those three souls meet, and will even that power be enough to stop the endless cycle of resets?

Frisk and Chara were supposedly just average kids, living in a world where the human monster war never happened. However, when they find out about alternate universe, it is a literal race against time, to save not just their world, but others too.

One of twenty-one - A young man named Carter - was pulled into Undertale under the command of different W.D. Gasters. When he comes across a Genocidal human, he has only one path laid before him - Fight, or die. (Spinoff of XWolf26's Doubletale. Final time I'm rewriting this one, I promise.)

A "shortcut" gone wrong results in Sans and Papyrus swapping bodies. But the greatest scientific breakthroughs often start as accidents—and this might be the key Alphys needs to save Chara and Flowey. (Includes Soriel, Papyton, and Alphyne as ships. Crossposted from AO3)

Everything has a story. And sometimes, those Stories don't start like you expect Part of We All have Stories Series, Cross posted wattpad and Ao3

Frisk is a 18 year-old young man who just graduated high school. He arranges a hiking trip with his best friend Jack, which leads to him falling in a mysterious hole. Can Frisk survive the monster realm?

Recordar el pasado debería tratarse de risas, nostalgia y alegría, algunas veces tristeza. Al menos eso es lo que Asriel Dreemurr solía creer, antes de que su hermana terminase perturbándole hasta lo más profundo de su ser. Para Chara, su hermano se está volviendo loco, y quizás tiene razón. Pero cuando no puedes confiar en tus propios recuerdos... ¿entonces en quién?

Reminiscing about the past should always be about laughs, nostalgia and joy, sometimes sadness. Atleast, that's what Asriel Dreemurr used to think, before his sister ended up shaking him to his core. To Chara, her brother is going insane. Perhaps it's the truth... but when you can't trust your own memories, then who can you trust?

The Riverperson is a very mysterious person in the Underground. Letting Frisk ride in their boat wherever they need it. They are always so carefree, but what if there is more underneath the surface.

For Monsterkind, the Surface represented freedom. For Frisk, it's a return to some uncomfortable realities. It all began with a simple wish. When that wish faded, Frisk tried to move on. Except, 'moving on' was not so simple. Emerging from the Underground had put them in a worldwide spotlight. From an unknown child, they had become an icon of great value.

Frisk woke up. What had happened? They soon found out they were not in control of their body. More to their dismay, the one controlling them wasn't a very merciful person. If Frisk doesn't get control back, who knew what would happen to the Underground? They would soon find out…

No one messes with his family. Not even a homicidal 12-year-old who can't talk.

A kid falls down a vast chasm into the deep, and is set upon by countless monsters eager to murder whoever falls down and claim their souls. Somehow, this child is the villain in your story.

A single choice has a huge impact. Not just on one person's life, but on everyone around them. In the Underground, there are many paths one can take. But when Frisk makes a choice that takes them off all the known paths, the world is changed forever, and Frisk becomes intrinsic to the fate of not just Monsters, but the whole world.

Thanks to a visit from an alternate Gaster, Frisk now has the power to heal the AUs, but something is trying to stop her. Can she succeed in her quest? Done as a request for dream1990. :)

Their plan had failed, they were going to die. A voice within struggled with what they did and was forced to watch their best friend die. It was over, but was it Really? The voice within tried to get him to get up, tried to do anything and when it seemed darkest they woke up.