Board Thread:General Discussion/@comment-31270796-20170326200357/@comment-26887879-20170328220200

You need HUGE amount of monster souls for power of human one. But as I remember, it doesn't need to be literally every monster in underground, just plenty of them. For example, it was implied that Napstablook's soul wasn't absorbed by Asriel.

But yeah... We never saw Amalgamate's soul's (even if they have one). They either weren't absorbed much like Napstablook or Toby simply didn't include special sprites...