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Chara was never 2B while fighting Sans. She reached that level of power after reaching her "absolute" and fusing with the game files and destroying the game. While fighting Sans, she should be stronger than Undyne (the strongest monster other than Sans on the Genocide route), who is city level in Undying form (maybe), possibly higher. Besides, each individual attack Sans does to the player only does 1 damage, he only removes invincibility frames. I would say that Sans is at least Town level, but not multiversal