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Millions of years ago, there was a huge century-old battle between angels and demons led by humans. After that battle, the demons were defeated. Just when the angels were about to destroy the demons in one fell swoop, a human being who coexisted with angels and demons appeared out of thin air and drew a dividing line between the angels and demons. There has never been a large-scale war in millions of years, but after millions of years of erosion, later generations have already figured out how to crack the dividing line...