Underfell, Undertale AUs Wiki

Underfell is an aesthetic AU created by an unknown author(s) that was put up on a blog, abandoned, and then taken up by the Underfell fanbase. The premise of Underfell was that characters were first and foremost created as an aesthetic design about what an alternate universe would look like if the characters' moralities were reversed. In other words, kind monsters were turned evil, and evil monsters turned good. There was never an officially established canon, other than the design of all the ma

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