Ark's childhood friends who are among the first to be brainwashed by Yuuya.

The Demon King’s fortress loomed in the north, wreathed in perpetual storm. The hero’s party planned a frontal assault. They always had. But Leon knew another way: a forgotten drainage tunnel beneath the eastern ramparts, mentioned in a crumbling manuscript he’d found in a ruined monastery. The tunnel was narrow, flooded, and patrolled by venomous slimes. No hero would dare it.