Who was King Zhou?
That question caused the five-colored skeleton to become terrified. He said right away, "Be quiet, he is a supreme expert. If he hears you, we will all be very unlucky."
The demon smiled in disdain, "Supreme expert, how strong is he?"
In Human Celestial, the demon didn't dare to say he was invincible but he was amongst that group. Apart from Li Xiandao, he didn't fear anyone else.
Heaven Heart was the same. He looked on calmly and wasn't as afraid as White Bone Demon Lord was.