"So, the gods can curse each other?" Roi Astara shrugged. "The shinigami are not like the other gods. They are the reapers, the lords of death. It is their job to collect the souls of those whose time it is to die. But they have, from time to time, strayed from the path. It is not their role to cause death, only serve it. So IoSen cursed them to never wear shoes, so that they might be more inclined to stay upon the path."
