I’m looking for a young adult fantasy book that I read in middle school, I think. It’s a series I think.
It was about a kid that gets transported to another world that is parallel to his. Everyone in his world exists in the other world, and if someone dies in one, they die in the other. In the other world there was a powerful king who had some sort of magical power. He was betrayed by his advisor I believe but became more powerful I think.
The story line was very biblical, as I remember it. The advisor wanted power for themselves and started a kingdom of his own after his assassination failed. After that people’s eyes flashed red green or blue depending on their allegiance. Red if they sided with the evil advisor guy, blue if they sided with the king and green if they didn’t choose either side. The kid joins with the king and eventually brings a few of his friends I think.
The kings forces lose the war and the kid and his friends are offered a choice of joining the evil side or being executed. They are executed and then they are greeted by the king in some kind of heavenscape and the king uses his power after that to defeat the evil side.