The Last Element

Each year, The Selection fire chooses one boy or girl from each tribe to face the "evil-doing" Shadow tribe and overall try not to get killed. From the ceasing numbers of the rest of the tribes, you can tell the surviving part of this journey hasn't been going very well. The last group of children to go was never seen again, leaving their humble little village in great distress, since two out of three of the future leaders of the tribe had officially gone missing.