His back ached from sitting in the same position for so long . His eyes hurt from staring at the candle. And his mind hurt from imagining the flame going out. He continued to do all three of those things though, Camaroth told him he had to.
He wanted what Camaroth had, power. Those villagers hated him for his appearance, but they feared what the man could do so they’d let him be.
Shifting slightly, the boy refocused his mind on the candle, willing the flame to go out. He didn’t understand why it was important, but he wanted power.