House of Centurion: Legend of the Flamebearer:

The Flame does not choose lightly. And once it does, it does not forget. Allestros Centurion never asked to carry the Eternal Flame. Once a soldier, now a reluctant heir to a fire that remembers across lifetimes, he is bound by blood, prophecy, and scars that no crown can heal. When war threatens the kingdom of Lierien, Allestros is chosen by the Rite of Ashwake to become the Flamebearer-an ancient title once believed myth. But flame does not serve quietly. As forgotten powers awaken, and s...