The moment a dungeon NPC becomes self-aware, visible as a flash behind the eyes like a screen booting up.
Some dungeon NPCs cross over from scripted behavior into genuine self-awareness. Everly witnesses one directly in the crushing room beneath The Tower Maze: Everly's Ogre Mercenary, who had not spoken a single word since she hired him, lies prone in the sand facing her, and she watches "a flash, like a screen booting up, deep in the back of his small, black eyes."
What he says with his new mind is a rejection of her fatalism: "Maybe there's more to it than this. Maybe it's not inevitable, like you say." He is crushed a heartbeat later. That an NPC's first independent thought is compassion for a dying employer — and a rebuttal of The Inevitable Ruin — reframes what the dungeon's disposable extras actually are.
Mechanic that gives the chapter its last word, granting an NPC a mind just in time to comfort Everly.