There are three kinds of extended attributes: upper blood limit, lower resistance limit and attribute attack. These three attributes can be learned through three materials: dragon stone yuan, dragon stone storm and dragon stone injury. Longshiyuan can be obtained through the FB of the tomb, Longshibao can be obtained through the FB of Luofu Tomb, and Longshiyang can be obtained through the FB of Chaojing Tomb. If you upgrade these three attributes, you need to consume a certain number of corresponding dragon stones. When the level of the extended attribute reaches above level 5, it is necessary to join the clan to occupy the corresponding city, and the level of the city reaches a certain level. For example, if the maximum blood volume is increased to level 7, the clan needs to occupy Tianjun City, and the city level of Tianjun City is not lower than level 2.