Oh this is an interesting exercise
I'm literally just beginning to post my novel on here so there isn't much to read yet, but I'll give it a go either way.
The best hook I can come up with is sort of a surprise I would normally leave for the reader to discover in Chapter 5, but screw it:
"Two chosen ones, a race against time to find a powerful stone that holds the balance of the world, and either one is just as likely to get it."