Board Thread:General Discussion/@comment-26006155-20190131130037/@comment-26006155-20190302163507

The Amalgamates might seem immune to any damage that Frisk can do, but they're also very much like ghosts.

The encounter with the Mad Dummy tells us that only magic can defeat ghosts. Which is why you have to reflect his magical attacks back at him. And why Napstablook's tears drive him off.

You can defeat the Amalgamates in the Halloween Hack. They're powerful, certainly, but not invincible. You just have to hit them witht he right attack. An attack that Frisk, for all his psychokinetic powers, doesn't have.