^^Core Sans is a version of Sans that comes from a timeline where he fell into the core, much like Core!Frisk. Unlike C-Frisk, he is not Omnipresent or Omniscient, at the moment he is trapped in one area, which He likes to call Zone 0. I can’t really say any more than that at the moment. Sorry I can’t give you more details, but anything more would be a bit of a spoil for what I have in the works (which will be explaining how he became who/what he is, along with some other facts and details I think will be found interesting.)