C9474 Producing Blackstone

Why did Qin Ming purposely emphasize it again?

"Alliance Master, we have been mining blackstone all this time. The surrounding Ninth Grade blackstone is almost completely mined!"

"There are a lot of blackstone veins in the periphery of the Supreme World. With our alliance's ability, it shouldn't be a problem for us to mine more blackstone."

"That's right, Alliance Master