On the side of a mountain, on a hole carved by hands, located nine hundred meters above sea level, lived a decaying old man with his disciples; he was once called the dual master and was one of the few true strongest people to ever exist.
He was a just man who obeyed the law to the letter and often imposed his morals on everyone around him. He was loved by the common folk and hated by his friends and foes. Forcing them to only have one partner, putting a limit on how much they could drink, forcing them to struggle to earn their money, and forcing them to not accept gifts coming from people weaker than they were.
Fed up with his annoying behavior, his friends turned on him, barely beating in combat, having suffered heavy casualties, destroying his cores, sealing away his powers, and crippling him.