Thanks for the lore explanation, all y’all!
”He won’t stop being attacked until he acknowledges Intellect, but this will help clear his mind.”
Hang on. I have it. I’m going to try to break her connection to this world. Intellect paused, and all who had been attacked by Madness except Tull and Berin were freed from her influence. But it failed to make a difference. Intellect swore, and then reinspected his work. He froze. Oh no. His voice grew smaller. A sanitized copy… that’s why it didn’t work. I guess I need to be more careful.
This is Intellect realizing that Madness is not actually invading, and that I (his author, of course) just copied him over.