How to get QQ Huaxia Lucky Stone? What's the use?

Go to a material supplier in Sheng Yuan to buy a master-level refining scroll, and then choose to refine the marble. Materials need one kind of high and low grade alloy and one kind of high and low grade alloy (there are four kinds of materials, among which high grade alloy is slightly more expensive). The function is put when synthesizing the eighth gear equipment. A stone can increase the success rate of equipment synthesis by 10%, so it takes 10 stone to make an eighth gear equipment, and 100% can be successfully synthesized. A set of eight 80 yuan.