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An aural illness commonly found in Undertale and/or Deltarune fans (especially those in the SoundCloud community). People with this illness practically worship Undertale-related music (both OST and fan-made tracks), and dislike any other kind of music simply because it’s different. When listening to anything other than what they’re overly used to, their automatic response is mild disgust, and will most likely click off after just a few seconds. Naturally, people with this illness are bad critics.
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