"No one who has come into contact with that deadly poison has ever survived!"
Librie casually dropping hints that she knows more than she reasonably should.
Also, Librie sure is young-looking considering she's a mother and has been for the entire story (afaik).
I like how Haisha handled that situation, singling out the individual tribes and drawing attention to their leaders there, putting them on the spot and not allowing them to casually organize into an irresistible mob.