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As early as in ancient times, the Thunder Demon God in the demon world used his magic sword to cut open the space, forming a crack, and brought his slaves to the human world, planning to dominate it. Unexpectedly, the gods suppressed him, and a fierce battle broke out between gods and demons. At the cost of the existence of the gods, the Thunder Demon God was sealed, and there will be no gods in the human world from now on. After the war, only a small number of low-level monsters remained, and they multiplied in the human world and continued to thrive. When humans prospered, half-demon were born. Until now, in this modern era of prosperous human civilization...