Board Thread:General Discussion/@comment-26006155-20190131130037/@comment-38339538-20190222015510

Nowhere in the game does it say Sans only has 1HP. Only that he has 1ATK and 1DEF, and that his attacks only do 1 damage each (not counting poison damage). Also, everyone else takes more damage then their actual HP too, it's not them having ridiculously high HP, it's just us lowering their HP into the negative numbers.