The cold hum was made by old Zhu.

when the Royal Guard of Naga attacked him, he suddenly found that his attack failed when the halberd fell. This is something that he couldn't believe. Under such a short distance, his target could not escape in an instant!? The idea of

just turned in his mind for a while, and then he suddenly had a dark moment and didn't know anything.

but all the people on the scene saw that the figure of old Zhu disappeared suddenly, and then several cold lights flashed out on the Royal Guard of Naga who launched the attack. The guard's movement was so suddenly still,...