Holy shit, I hated Lambda, thought she was nothing more than a Bernkastel simp, and only started liking her from end of game 5 and onwards. But this really solidified her as the GOAT.
Wow, Erika's character development is remarkable. She went from intellectual rapist to actual rapist.
Jokes aside, I think I figured out the closed room.
There was a huge hint this chapter between Ronove, Virgilia, and Gaap. Gaap says "Escaping alone from [the closed room] is impossible."...