For the general practitioners, the upper grade of Qishi may be the high value, which is no different from the lower grade of Qishi. However, for those who live and die in a strong situation, especially those who are preparing for the thunder robbery, the upper grade of Qishi has a very special role.

A high-grade gas stone, which is almost pure to the extreme, can be transformed into a large number of spiritual power in a very short time, which can not be achieved by middle-grade gas stone and lower-grade gas stone.

Generally, people with strong life and death will prepare a large number of boulders during thunderstorm, preferably...