I wish that I hadn't read this sub now! It's good, really good, but I just want to grab a couple of the ideas and work them into the 30 Starships sub that's been in my to-do folder the last 3 months. Guess I'll come back to that one once this has left my grey cells.
Not every prophecy needs to be meaningful to effect a game. In the Lord Dunsany play, The Golden Doom, a child's scrawl has an entire kingdom struggling to puzzle out what sinister prophecy it portends.