In Chapter 180, four people are stupid. Zhang Yao's words are the beginning of lion's big. It is necessary to know that the common currency in the world of cultivation is crystal, which is the energy stone to start the transmission between the stars and the supplement of its own strength loss. In addition, there are two kinds of common crystal and polar crystal. 1000 ordinary crystals are equal to one polar crystal. Of course, there are also crystal cards issued by various forces. But the face value of that kind of crystal can only be handled with at least 100000 polar crystals. The desert world does not produce crystal...