C821 This Old Man Has a Problem

In Hou Qing's hand appeared three black balls.

This kind of thing was very common. It should be some kind of concentrated Spiritual Weapon that used to form a formation, hiding the formation within.

"One for each person. You can keep them well now."

Hou Qing handed the two balls over.

"Wh, exactly what formation is this?"

Xu Liusu was curious about it and looked it up and down. Then