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

There are currently 507 articles, 2,180 files, and 198 active users on the site!

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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

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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Poll
What is your favorite AU? Remember to read the entire list before voting.
 
138
 
138
 
51
 
40
 
85
 
23
 
127
 
9
 
73
 
32
 
85
 
47
 
16
 
12
 
57
 
264
 
35
 
193
 
45
 
12
 
555
 

The poll was created at 01:03 on March 13, 2019, and so far 2037 people voted.


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