Was this iron chain also part of the illusion?
Just now, when the other agents entered, they walked directly through the door, combined with what the previous agent had mentioned about the Imaginary Cage...
Lucina suddenly understood something, nothing in this rotten place was real! Everything was just an illusion concocted by the Imaginary Cage.
Although she wasn't a Spiritual Ability User, Lucina had smuggled Holy Relics across the sea with Hainerd and knew something about the mutated items controlled by the Administration Bureau.
The chance to escape was every time the torture ended, in that moment when the illusion disappeared and reappeared...
"Finish her quickly, Chairman Clayvin doesn't want to wait too long."
After the agents finished talking, two of them walked out the door, leaving only one person behind in the factory.