This is a strange game.
Every SpeedIF4 entry includes Nostradamus among its various requirements. What’s strange, in this case, is after you meet Nostradamus, inexplicable prophecies, probably actual ones by Nostradamus, appear in place of many of normal action responses. They have no direct relation on the game, as far as I can tell.
Also, an onion appears in your inventory sometime during the game without warning.
Until consulting a walkthrough, I couldn’t find the ending because I was navigating a series of vague oracles. Beating the game didn’t clear it up any.
Certainly an unorthodox approach to including Nostradamus, but ultimately frustrating and unhelpful.