I read a book about 15 years ago that I’ve been trying to find recently but can’t remember the title for the life of me.
I remember that it involved a war between at least two kingdoms, one called Green and the other Black or Grey, and at some point a lost kingdom called Orange. Half of the story took place in this fantasy world and the other involved two teenagers in our world.
If it helps at all I can remember what the cover looks like. It was a man hiding under som tree roots with his sword half-drawn while some sinister-looking guards look for him in the background.