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Welcome to UnderBlanc — an unofficial UNDERTALE AU.

This AU has strict rules to protect the story and worldbuilding.

Please read the full guidelines before creating or sharing anything related to this AU.

Fanart only. No fanfiction. No derivative AUs. No NSFW.

#undertale au #undertale fandom #underblanc #fanwork guidelines #au rules #do not copy #snowtale

SilenceScore

In a world ruled by music, silence is treated as absence.

Monsters live through rhythm, resonance, and sound.

Then a deaf and mute child falls into the Underground.

Her name is Rest.

Guided by a smiling maestro in a hooded tailcoat, a wandering flower born from loss, and the lingering shadows of the dead, Rest walks through a world she cannot hear — yet somehow understands more deeply than anyone else.

This is not a story about defeating silence.

It is a story about discovering that silence was always part of the music.

#undertale au #undertale #undertale fandom #SilenceScore

xtaleunderverse

Underverse Studios

reignbeaux13

akaneya

How many more times……

Geno belongs to @ loverofpiggies

kawaiiparasites

AZM!SwapKiller AU Guidelines

AZM!SwapKiller is an Undertale AU created by Japanese creator Agatsuma-Azuma.

It's a take on SwapKiller by Agatsuma-Azuma, blending Canonswap (the official interpretation of Underswap) with SomethingNew.

This AU is based on the interpretation: “What if the events of SomethingNew happened in the Underswap world?”

AU Type: “My Take” / “Combo-Style”

Attributes: ‘Negative’ / “Dark AU”

※If you wish to use any images, please feel free to contact me.

Worldview

Amidst the endless repetition of the Genocide Route, Papyrus, utterly exhausted by everything, accepted Frisk's invitation and embarked on a path to massacre everyone in Underswap.

As the massacres repeated, he began to derive pleasure from the act of killing. Eventually, he even took Frisk's life, seized their reset ability, and reset the world.

He altered the world into a timeline where only he did not exist, vanishing to escape his guilt.

Papyrus regrets it—regrets having committed the irreversible.

He regrets taking everyone's lives, taking his brother's life.

He cannot forget coldly telling his brother, “You don't understand my feelings,” before killing him.

After the reset, in the recompiled world, only his brother Sans waits for Papyrus to return.

The Goodwill Ambassador Chara also comes to check on the Under world, but he remains motionless in Snowdin, waiting alone in his house.

Characters

🎯Swap!Killer!Papyrus

“＊SAVE ME‥”

Distinguishing nickname when listed with other AUs: “Splatter” Image emoji: 🎯

The form of Swap!Papyrus after the events of SomethingNew in the Underswap world.

After being incited by Frisk to kill everyone,

he later killed Frisk, reset the world, changed it into an “Underswap world without himself,” then vanished and fled.

He wants to apologize to everyone, return, be forgiven, but feels he has no right to see them.

A self-proclaimed realist wandering after escaping the world.

After the reset, he should have been erased from the world's inhabitants' memories.

Equipped with a modified hoodie, tank top, and toy knife.

Its soul undergoes gradual changes based on its mental state before reverting.

As it nears a rampage, its expression warps from Frisk-like features into eerie, distorted eyes.

During extremely rare moments of sanity, it desperately begs to be killed.

During the period when Frisk incited him to kill everyone, he wielded a real knife.

The weapon used to kill Frisk was the toy knife. He uses the toy knife as his weapon thereafter.

Official Megalovania “Splattered Reality”

Video creation & music by Ramune-sama! Thank you so much!

🔓Swap!Waiter!Sans

Distinguishing nickname when listed with other AUs: “Waiter” Image emoji: 🔓

While everyone heads to the surface, this Skeleton remains alone in Snowdin. Waiting for someone to return to them.

Close with the Goodwill Ambassador Chara.

Remembers everything about their younger brother. Wants to scold them when they come back.

💡Swap!Knower!Chara

Distinguishing nickname when placed alongside other AUs: “Knower”. Image emoji: 💡

A human who took the True Pacifist route, killing no one. Currently serves as a goodwill ambassador on the surface.

Has been adopted by Asgore and occasionally visits the underground to check on things.

Has no memory of the time Frisk possessed him.

Suspicious that an entity named Papyrus once existed?

Fan work Guidelines

⚫︎This AU respects the designs of “canonswap” and ‘SomethingNew’.

Therefore, changing the designs of siblings in this AU to “fanonswap” or creating derivative works based on fanonswap-ified AUs is prohibited.

⚫︎While adhering to the official Undertale guidelines,

and following the policy allowing fan activities/creations for both “underswap” and “SomethingNew”, fan activities for AZM!SwapKiller are fully permitted, including paid distribution.

⚫︎The type of fan creation within doujin activities is fundamentally free, but here, fan creation is defined as “something created by your own efforts.” AI-generated content is not recognized as fan creation. Absolutely do not do this.

⚫︎It is possible to incorporate the AZM!SwapKiller AU into the story of another AU. For example, feel free to use characters from it as villains or minor roles in your own AU creations.

⚫︎Shipping creations, death , or destruction using AZM!SwapKiller are also permissible. If another AU is involved, you must strictly adhere to that AU's guidelines as well.

⚫︎Using “Splatter” in trio-based AUs is permitted, but other characters cannot be used.

Terms Regarding the Song “Splattered Reality”

These terms have been carefully documented in consultation with Ramune, the official creator of Megalovania.

⚫︎“Splattered Reality” was fundamentally created for AZM!SwapKiller. Therefore, the use of “Splattered Reality” in works unrelated to AZM!SwapKiller is prohibited.

⚫︎ Use as a SwapKiller-related song in trio AU works is permitted.

⚫︎ When using “Splattered Reality” as BGM for fan art videos, etc., please credit either by “mentioning Ramune's name” or “providing a link to the original Splattered Reality video.”

Guidelines Last Updated

2025/08/14

This text was translated using a machine translator. If you notice any awkward phrasing, I'd appreciate it if you could let me know.

Japanese my homepage version↓

https://kawaii-parasites.lovesick.jp/works/imozurusector/auguidelines/446/

Happy New Year.

I appreciate your continued support in the coming year.

I hope 2026 will be a joyful and fulfilling year for you all.

#happy new year #new year 2026 #new year greetings

This is a continuation of my Underblanc story.

in dream.