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

There are currently 548 articles, 7,466 files, and 164 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.
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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
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...)



Latest activity


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.
 
75
 
70
 
23
 
29
 
50
 
16
 
67
 
3
 
44
 
21
 
50
 
26
 
14
 
6
 
21
 
148
 
14
 
102
 
31
 
9
 
279
 

The poll was created at 01:03 on March 13, 2019, and so far 1098 people voted.


Article Creation
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