C410 Four Kinds of Danger(2)

Yun Bing didn't know how to answer, "This …" I have seen it in an ancient book. I know a little bit, but I still need Instructor Ruofeng to guide me in the specific usage of it. "

"I didn't think that Instructor Ruo Feng would know the long-lost profound formation of the Profound Light Continent." Yun Bing said.

"Right, that's a little bit. He was given to me by an old friend