In this au sans was normal and the core was powered by liquid goo sans tripped when he was little and fell into the core gaster caught him with blue soul magic but sans had touched the core now this goo version of him infects him when things get I.N.T.E.N.S.E.
https://www.youtube.com/watch?v=iVs-CQ8dF5c for the theme @Dew1th for the animator and me for the rest
