I recommend the two novels 'Battle Through the Heavens' and 'Devouring the Heavens.' Both of them used Dou Zhe, Dou Shi, Dou Ling, Dou Wang, Dou Huang, Dou Zong, Dou Zun, Dou Sheng, Dou Di, and other Dou Qi ranking systems. They described the story of the protagonists who trained Dou Qi on the Dou Qi continent and gradually became strong. I hope you like this fairy's recommendation. Muah ~π