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UNDERSECRETS: an Undertale fan ficton created on wattpad.)

Reads 12
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Parts 3
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Reads 12
Votes 0
Parts 3
Time 10m

anonymoususer undersecret undertalefandom undertalegang undertalewattpadstories

Finally they all make it to the surface. However after something kills both the monster king and human president, Sans and Frisk reveal a terrible secret that departs the entire group, even Frisk and Sans. Now it's up to "Anonymous Name/User" to stop it all. While trying to defeat the most destructive supervillian the world has ever layed eyes on.All Rights Reserved

anonymoususer undersecret undertalefandom undertalegang undertalewattpadstories

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Endless possibilities (Underfell Sans x Gender Neutral Reader)*BEING REWRITTEN!* by glossedweed

Word has been released that monsters now roamed the surface, and you can't help but feel slightly skeptical. You had been told since childhood that monsters were vile and repulsive creatures who wanted nothing more but human blood pouring from the palm of their hand. You didn't know what to think of the monster race, but majority of the human race did. The tension between monsters and human kind was sickening. People had told you to stay away from monsters at all costs. But that'll be a bit difficult when two skeleton brothers move in next door to you. And why bother lying? You can't deny that one of them has stuck on your mind. (Warning. There's a lot of colourful language, so just a heads up. And also, the artwork doesn't belong to me. Credits to the rightful owner.)

Determined to Stand by Luna-Moon-201

After 3 years after Frisk flee the monsters from the Underground. She lives happily up on the surface with her new family of monsters. Well with Toriel, Asgore, Undyne, Alphys, and Flowey left to Washington D.C to meet the president. Sans and Papyrus are left to watch Frisk till Toriel returns home. Chara has plans to take control of Frisk. He wants her soul and to Reset the world again. There is however another person whom lurks beneath the shadows that Sans and Papyrus kept secret from Frisk. Now it's all going to be reveal. So many mystery to solve and secrets to uncrack. Frisk will soon have to face her fears and overcome Chara's evil plans. With the help of old and new friends. Note: Frisk is a female in the story and Chara is a male.

Conduit Tale-An Undertale Fanfiction Novel by Serena_Walken

(Complete)Hopeless and in despair, Sans never thought he could escape the resets and continues caused by FRISK that tormented his life. But, when he thinks the kid is possessed and stops FRISK once and for all he finds out ... that he never really knew anything after all. No more resets. No more saves. No more hiding. Life will never be the same for the Underground. Souls and Science can be an unforgiving bitch. Relationship: Because of the nature of the way this fanfiction works, there are several Frisks. He knows all of them, but Sans only falls for one, and she is definitely over the age of 18. This doesn't blossom until some time later though, as this is way more than a sweet romance. Buckle up for some tragic dramatic scifi-twisting to the fantasy world of Undertale!

Just a very big love (AU sans x reader) by SpaceBean1323

After All AU's of Frisk's death, all of the sans have been depressed losing their love/friend of their live. Until.........(Y/N) fell to the underground. As all of the sans met her, they soon realize how much she meant for them. As for (Y/N), she began to realize that all of the sans are starting to fall in love with her........ (WARNING: Curses and sadness if your sensitive to both or one of these dont read it or you'll get more sensitive XD ^^)

Under Infusion Tale- (An Undertale Fanfiction Novel) by Serena_Walken

(Complete) Monsters may be free, but there is a high price to pay for the one that freed them. Deciding Frisk is better off being a mystery, the monsters leave it alone for 14 years. Until Frisk is discovered. Undyne and Sans try to reach her in time, but she is left with a fatal wound. With even boss monsters unable to heal her, Sans heals her the only way left. However, that was part of Gaster's plan . . . but Flowey was not. The result is wedding bells ringing twice for Frisk. Once to Asriel . . . and once to Sans? *Frisk and Sans eventually.

Underfell Papyrus x reader- All hail the king (Completed) by Kath1908

A young human runs out of the ruins desperate to get to safety. She runs into the Skeleton brothers Sans and Papyrus. Before she can know what's happening her world is completely thrown upside down. Sans is horrible but Papyrus.... he's not as bad as he makes himself out to be. What will happen to the young girl? Will she be saved or killed? And will she finally figure out the secret her mother was hinting at before she died?

the Undertale Adventures by Nanmaku113

What, if you meet Sans and get a crush on him? You two would move into the underground and experience some funny adventures together! Get ready for: The Undertale Adventures ~Pibs

UnderCorrupt by ANinnyMouse42

I have an Idea for an Undertale AU. And apparently, it's a good idea? So here, have a book. --- Long ago, two races ruled the earth. But when a plague of corruption swept through one species, causing a half of their population to attack the humans, the humans thought it safer to banish all the monsters underground. Now, the Underground is a Battleground. The battleground of the Pure and Corrupt armies. This Is UnderCorrupt. -- COMPLETED!

Undertale X Reader [In Remake] by Cat_Maipie

Let's get to the point shall we? So let's look at the list here... You're a... no information? Hm, interesting i guess, I'll have to base it off my observation. Whatever, you're a human, well kind of. You're a human and a monster at the same time, more like in between. Let's say... player? Better than nothing i guess. You're your own person. Sometimes you control frisk, sometimes you don't. You can also move through timelines, and also universes but that may be too risky huh? You'll find more about it soon... THIS CONTAINS VIOLENCE PLEASE BE WARNED! Lemons? Maybe. - #57 in sans 12/14/25 - #1 in floweyxreader 01/10/25 *** COVER : Credits to the person who made it GAME : Toby Fox

Insanity by SatanTM

¥warning, this is a sequel! The first one is called Secrets.¥ After three years of finally having peace between monsters and humans something goes wrong. Frisk goes to bed and when she wakes up she's on a familiar bed of golden flowers. A scared and tattered little flower with a face befriends her and everyone else she knows is trying to kill her. It's like someone Reset and when they did everyone went insane. How is she going to deal with the love of her life and her best friends trying to kill her at every chance they get? How is she going to get back to her timeline with the ones she loves? And most importantly, who did it?

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Slide 1 of 10

Endless possibilities (Underfell Sans x Gender Neutral Reader)*BEING REWRITTEN!* cover

Determined to Stand cover

Conduit Tale-An Undertale Fanfiction Novel cover

Just a very big love (AU sans x reader) cover

Under Infusion Tale- (An Undertale Fanfiction Novel) cover

Underfell Papyrus x reader- All hail the king (Completed) cover

the Undertale Adventures cover

UnderCorrupt cover

Undertale X Reader [In Remake] cover

Endless possibilities (Underfell Sans x Gender Neutral Reader)BEING REWRITTEN!

Word has been released that monsters now roamed the surface, and you can't help but feel slightly skeptical. You had been told since childhood that monsters were vile and repulsive creatures who wanted nothing more but human blood pouring from the palm of their hand. You didn't know what to think of the monster race, but majority of the human race did. The tension between monsters and human kind was sickening. People had told you to stay away from monsters at all costs. But that'll be a bit difficult when two skeleton brothers move in next door to you. And why bother lying? You can't deny that one of them has stuck on your mind. (Warning. There's a lot of colourful language, so just a heads up. And also, the artwork doesn't belong to me. Credits to the rightful owner.)