How can I write a prophecy without giving away the plot? If that's possible.
The fun thing about prophecies is they almost never turn out the way you want them to or expect them to. One of the most basic things to understand about prophecies is that wording is everything. Every prophecy ever conceived has a bleep ton of double speak, and allusion and riddle. So writing a prophecy doesn’t inherently give away anything because there’s always a twist. Another thing to think about is peoples’ reactions to prophecies. Most people will try to influence the outcome in some way. Take Oedipus’ parents. They tried to kill their baby to keep it from coming true, and it was that abandonment that allowed the prophecy to come true. So to answer your question there are a few ways:
1) wording: make it ambiguous or riddle like or even just a bunch of mumbo-jumbo
2) human involvement: make the prophecy so clear that it can’t possibly be misunderstood, and then throw humans into the mix. They can mess it up or cause it to come true and that will give readers a sense of adventure and tension.
Hope that helped.
P.S. I love your handle. Herrigan and Lowdermilk are the best.