Although this Eight Level Devil Scripture is the devil race's scripture, it's still alright. Wang Teng's eyes glittered. He quickly accepted the background of this scripture.
He was different from others!
Other people didn't have dark talent, so they weren't able to practice the Eight Level Devil Scripture.
If they wanted to possess the dark talent, they needed to convert using special methods. Yao Hongshou was an example. That guy had almost turned into a devil.
However, even then, there was a huge price to pay, and it wasn't perfect. A half-human half-apparition state was the furthest one could go. Most of these converters would lose their conscience and turn into slaves of the dark. They would become low-level dark apparitions, killing tools for other devils.