| Possible spoiler
My following suggestion is unproven as I have not been in the situation of losing Da Vinci before receiving the Nostradamus quest but I hope it helps ...
Have you spoken to Lucius in Montaillou? This should trigger the Rescue the People of Toulouse quest.
I'd suggest that you take the peaceful route and talk nicely to Tereo when you reach Toulouse. You can then talk to one of the Titans (Menoetius) who makes mention of Nostradamus and will mark the cavern's location on your map.
Good luck ! |