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

There are currently 372 articles, 9,849 files, and 195 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.
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This site contains spoilers for Undertale. if you have not completed the game, you may get spoiled.


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
Undertale Rho
Undertale Rho

Undertale Rho is an Undertale Alternate Universe created by Ioannis Argyris that serves greatly in expanding the universe of Undertale, presented primarily in the form of novels and short stories. At present, the entirety of the universe of Undertale Rho (taken short-hand to be Universe Rho) is shrouded in mystery. While still holding close to the original story told in Undertale, Undertale Rho is not beholden to it, and some elements from Undertale are rewritten entirely. (more...)


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IMPORTANT
Final check is initiated, please do not remove the Checks Out template. Wait for an Admin to come by and check off your page. Removal of the {{Checks Out}} template by unauthorized users will result in an immediate banning of the violating user lasting 3+ months. This is your only warning. Thank you for your co-operation.


Poll
What is your favorite AU? Remember to read the entire list before voting.
 
247
 
234
 
96
 
229
 
36
 
7
 
42
 
62
 
66
 
2
 
72
 
2
 
363
 
5
 
76
 
94
 
8
 
16
 
3
 
7
 
15
 
987
 

The poll was created at 04:04 on October 17, 2017, and so far 2669 people voted.


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