True agency in the Greyrat household is found not in magical capacity, but in the willingness to abandon stability for the sake of competence. While Rudeus operates at YPS-4, his power is a systemic advantage—a byproduct of a reincarnated adult's cognitive focus and innate mana. His journey is an exercise in management: managing his trauma, his lust, and his terrifying potential. In contrast, Eris’s ascent to YPS-3 is a radical act of self-definition. By choosing to leave the person she loves to undergo years of brutal training, she rejects the role of a protected companion. Her growth is not a gift of the system; it is a manual override of her own nature. Rudeus seeks to be worthy of his second chance, but Eris seeks to be worthy of herself. This creates an asymmetry where the character with lower destructive output possesses a higher degree of raw, unassisted willpower. The narrative uses Rudeus as the anchor of the world's logic, but it uses Eris to challenge the idea that power is something one is born with or gifted. Her sword is not just a weapon, but a rejection of the aristocratic fragility that once defined her. In the economy of the series, Rudeus's power is a tool for preservation, while Eris's power is a trophy of survival.