A lot of the chemicals have leaked along the floor and the materials that have been in contact with it were damaged. If you're going to attempt crossing, make sure the materials you're using are sound.

[ does she tense slightly at the mention of taking lights from lanterns? maybe, don't worry about it, it's gone when she speaks again. ]

It's possible that the psychological effects aren't just a defense mechanism, but a result of simply being around the World Eater. A few of us exploring the power wing were affected when we got close to the portal room.