Just Entered the Third Year of High School, Awakening the Billion-Year Soul Ring at the Beginning

By chance, I traveled to a world where spiritual energy was revived. Here, everyone can awaken their soul rings to fight against monsters. However, due to Li Ran's poor physical condition, he could only bind one soul ring, so he was regarded as a waste by everyone. Just when he was desperate, the god-level soul ring system awakened. As long as you kill monsters, you can advance to the soul ring. "Ding dong, kill the nine-tailed demon phoenix that lasts for a thousand years, and the soul ring will increase for a thousand years." "Ding dong, kill the ten-thousand-year-old Netherworld Ghost King, and your soul ring will increase for ten thousand years." "..." Decades later, Li Ran looked at his billion-year-old soul ring and the corpses of countless monsters in front of him...