Immortal's Omniversal Conquest

He was once the Infinite God King Immortal Emperor, the strongest in his universe. However, his life ended at the hands of the true protagonist! He had believed he was the protagonist due to his talent and power, but it turns out he was just a stepping stone. As he died, he felt a sense of peace and closed his eyes to sleep for eternity. But when he opened them again, he found that he had reincarnated as a Japanese boy named Kamiya Ryuuga. A special bead he had found in a unique realm also reincarnated with him. With this bead, he will start his journey to become the strongest and take revenge on the protagonist who killed him before! — — — — — — — — — — — — — — — — — — A/N: Don't worry, this is not a typical Chinese cultivation novel. His grand background is just for comedic effect, as I've decided that he will sometimes act like a young master, hehe.