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

There are currently 511 articles, 2,647 files, and 66 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

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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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.png

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...)




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Latest Blogs
Bravopotato Bravopotato 7 days ago
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please help me out ;w;

Please help, i have no idea about how to mak…

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Undercake - A Strawberry Shortcake Undertale AU

Undercake is an AU that replaces Undertale cha…

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