then add some gaster
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A fic about a human with dragon wings who steps into the Underground and gets transformed into a lizardman by the Barrier. He soon discoveres that there is more to the mountain than he thought, and that his soul is not entirely what he used to think it is.
(Deltarune chapter 1 kicks in later, and is a big part of the plot. If you're reading this after the full version has been released, please forget everything you've seen in chapter 2 and further.)