This was a secret that Zhao Hai learned after he recruited a few high-level undead creatures. He didn't know about it before.
Because of this, although Zhao Hai had never fought with a Buddhist disciple before, he was still very afraid of them. Putting everything else aside, the fact that the Buddhist sect could make the other major sects in the cultivation world compromise and agree to their conditions was enough to show how strong they were.
The cultivation techniques that Zhao Hai had obtained were the most authentic of Buddhist cultivation techniques. Even ordinary Buddhist disciples were not qualified to learn them. This was why Zhao Hai was hesitating. If he learned these cultivation techniques, he would be exposed when he faced Buddhist disciples in the future.
