C405 Gas for Cultivation

Were these crystals so hard to obtain? Qin Feng looked at these crystals in disbelief. However, no matter how Qin Feng looked at them, the final result was a normal crystal.

As for the gas in the crystal, Qin Feng didn't understand it at all. He could only attribute it to the fact that a substance was trapped inside the crystal and eventually became like this. After all