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This is a fantasy continent where people can transform themselves through souls. Different souls can change into different forms and have different functions. Where does the soul come from? Some strange and strange beasts have powerful souls that can survive death, so they are refined and used by humans and become weapons of war. Therefore, humans wantonly slaughter alien beasts just to obtain more souls. Their greedy desire makes humans constantly refine their souls, and eventually even their own souls become filthy, containing hatred, violence and cold-bloodedness. These people are just evil beasts in human skin, they are real devils!