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Melesar and other Apostles are more like victims of the past. Take Victor, for example: judging by his diary, he was once a dedicated and respected captain of the guard, but in the end, the stone drove him mad. Melesar was probably a typical slave owner for his region, but in the end, the curse amplified everything to the point of insanity. And with the princess's friend, it seems like everything is reversed: the stone made her kinder than she actually is.
As for Rinze, she seems to be in her right mind.