The Classic of the Dead!

Ye Xuan frowned slightly, “Is it a cultivation method?”

The man in black said with a smile, “Sort of.”

Ye Xuan hesitated and then asked, “Is it powerful?”

The man in black laughed, “It depends on what you compare it with. If you compare it with the prophet, it is not powerful, but if you compare it with some of the rare beasts here, it is!”

Ye Xuan looked surprised, “It can beat ...