It's a dimly lit small dungeon area of sorts, filled with empty cells. The stonework has an emerald green tint to it, as does the light itself.
Ivan: "...Well that's new, isn't it?" He takes a good whiff of the dungeon air...
...And coughs. Yeah, kind of dirty in here. Regardless, he chuckles.
"Wonder what kind of dungeon this is, right Arsenic?"
Arsenic: "...What do you mean?"
Ivan: "Well, what kind of dungeons are there? Go on, tell me!"
Arsenic: "...Dungeons. Am I missing something here?"
Ivan: ...With a sigh, he puts his arms to his side in defeat. "Whatev. Doesn't seem to be anything in here besides weird torches anyways...any other rooms?"
Arsenic: "I saw one other door...weird, since normally there's four rooms total."
Ivan: "Huh. Maybe this ripworld's designer just got reaaal lazy. Onwards!"
He parades out...Arsenic giggling under her breath as he does.