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The narrative leading up to the advent of the divine era was quite cohesive, telling stories that were seamless and straightforward, without the tendency of featuring a new boss in each installment. Even the appearance of Cecil in the seventh installment had been foreshadowed, making her emergence seem reasonable.
Cecil was ultimately defeated, not because of the human protagonists' achievements, but due to her sister's unfortunate betrayal.
This sister was known as the Empress of Night from an alternate universe. Unlike most creatures from that world, she was powerful but harbored a love for humanity, preferring peace over war. Upon learning of her sister's intent to annihilate the entire human race, she struggled before betraying her own sister and joining the human, or rather, the Angel Camp.