Board Thread:Questions and Answers/@comment-5956954-20151218115701/@comment-27401333-20160107130308

I think we are missing the point. SOULs can only be harvested from dead monsters, and are hard to grab without determination. Asgore would have to sacrifice his SOUL too, as EVERY monster in the underground must contribute. (This part is speculation, but I believe that all the monster SOULs are just shy of 1 human soul, it's somehwere in Waterfall if anyone can find it. 7 Human souls are simpler than every monster * 7.