Rod of Remorse
The Rod of Remorse (悔悟の棒 Kaigo no Bou) is an item used by the yama.
Every yama will always carry this rod with them. A yama will write the nature of one's sin on the rod. The worse the sin, the heavier the rod becomes. Those who did many wrong things are beaten many times with equal proportion to their sins. The person in question will be beaten up until they repent.