Di Ling'er's secret manual was delivered a few hours ago. There was not just one book, but three!
There was really no justice in this world. With enough power in one's hands, it becomes impossible not to try and reap benefits for oneself or one's clan. Di Ming was named the General Pavilion Lord of the Earth Emanations Domain's Demon-Killing Pavilion. He had too much power in his hands and too many resources to match. Just one word from him, and he could get several secret manuals immediately.
Among the three secret manuals, one was about the lessons on cultivating Divine Sound Laws. The book described in detail the basic knowledge required for Divine Sound Laws, the development pathways, and various uses of the laws. This was basically an encyclopedia. It helped Jiang Yi gain a more holistic understanding of the Divine Sound Laws.