Board Thread:General Discussion/@comment-30388913-20170828193135/@comment-13682699-20171230065508

A human SOUL has the equivalent power of every monster SOUL in the underground. That is currently the only reference as to how powerful human SOULs are. Best guess as to know how much determination it takes to melt any normal monster is to take a look at Undyne; she is a naturally determined monster, and under certain circumstances even capable of melting under her own determination.

Despite her determination being at max on a Genocide run, it still isn't enough for her to remember SAVE/LOAD/RESETs like the other humans or Flowey. However, she has displayed a stronger sense of deja vu compared to everyone else and she actively changes her patterns more often.