Undertale AU Wiki

Welcome to the Undertale AU Wiki, the main place for documenting Undertale's AUs. If you wish to contribute, just know that it is REQUIRED for you to read the Rules and Guidelines and the Policy of the Wiki BEFORE doing so.

As this is an AU Wiki, this wiki is NOT meant for characters. The Undertale OC Wiki exists for those. This Wiki is also not meant for AUs that do not have presence anywhere else, and those should be put on the Undertale AU Ideas Wiki.

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Undertale AU Wiki
Undertale AU Wiki
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Undertale AU Wiki
Welcome to the biggest encyclopedia on Undertale and Deltarune AUs.

There are currently 609 articles, 2,806 files, and 28 active users on the site!

Just know that it is REQUIRED for you to read the Rules and Guidelines and the Policy of the Wiki BEFORE contributing to our Wiki.
If you have a question about certain things here on the wiki, visit the Questions and Answers Forum Board and ask there. Be sure to read through the FAQ first, as your question might already be answered there.
And if you see something on this site that is yours and you are unhappy with its presence here, please contact Alphasaith with a link to the page that steals from you and a link to the proof of this being your work.

This site contains spoilers for Undertale. If you have not completed the game, you may get spoiled.

Alternate Universes
Music
Games

Alternate Universes

The Undertale Alternate Universes of the Multiverse.

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Music

Fanmade Songs by the Community.

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Games

Fanmade Games by the Community.

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Alternate Universes
Music
Games
About Undertale AUs
Undertale Alternate Universes, or "AUs", are alterations to the story, world, and/or characters of Undertale, be it crossovers, changes in aesthetic, or role-swaps.

"AU" is an umbrella term that includes "ATs".


Featured Article
Inverted Fate
Inverted Fate - Characters

Inverted Fate is an Undertale AU taking place after a failed True Pacifist run. Asriel won the final battle and started to reset time, but lost control of his powers, resulting in the six main characters or "lost souls" swapping places but not personalities. This ends up creating a very different Underground.(more...)




Official Affiliated Pages
Undertale AU Wiki - You are here

Undertale OC Wiki
Undertale Ideas Wiki


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Latest Blogs
SheepDeprived SheepDeprived 1 day ago
0

Wandertale progress/rant (Dec. 9, 2024)

Today when I was composing a song for Wander…

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SheepDeprived SheepDeprived 5 days ago
0

This site is so scary HELP MEE I just wanna make a funny little wiki for my au Wandertale

HOW DOES THIS SITE EVEN WORK

THIS MAKES NO SE…

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