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In the underworld, there is a magical thing called a demon soul. Everyone's demon soul is different. Some are blood demons, some are dark demons, and some are red demons. The higher the quality of the demon soul, the stronger the strength. But if you want to use the demon soul, you must first have the demon soul. Only the demon soul is useless without the demon soul. And demons are also classified, some are plants, some are animals, and some are artifacts And our male protagonist was born in this world. . .