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The cycle of heaven and earth is mystifying beyond compare.
Chu Yuan applied it on Jiuyou, constructing a space-time of reincarnation with immense mana, experiencing lifetimes of reincarnation. The most terrifying aspect was simulating one's life in the form of an illusion.
But this surpassed the art of illusions by an unknowable margin.
Within the cycle of heaven and earth, everything you experience is real; you cannot feel any difference, yet to the outside world, it is but a brief moment.
Chu Yuan let Jiuyou undergo the cycle of heaven and earth, which also served as a tempering of her disposition.
When the light of reincarnation that enveloped her dissolved away, Jiuyou slowly opened her eyes, exhaled a long breath, and inquired, "How much time has passed? I felt as though I had spent millions of years within this cycle of reincarnation. Awakening feels like emerging from a dream; everything before me is as it was, but I am still me—I am very clear on that."