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Not to mention that Ceroba drank alcohol because of the loss of her loved ones, and alcohol has a strong effect on health.

According to Gerson, based on the canonical version from Undertale. Monster bosses (which include Kanako and Chujin, according to Chujin himself) grow by borrowing power from their parents' souls, and since Chujin died, Ceroba alone gives her power(and she is not a monster boss)and ages much faster.