"Yunmeng ... yes, I believe I've heard the name." If Claudius were more detached, he might pretend a distant recollection, or say something vague and consolatory about Lotus Pier. But in the context of Lan Wangji sharing something deeply private -- the story of how Wei Wuxian lost his core -- it feels wrong to use the knowledge for a social game. "Quite a different world from this mansion between worlds, I'm sure," he says, employing a different sort of vagueness. "I'd love to hear more about it."