What is orochimaru's ring in Xiao Zhong?

Nine people all have rings, and the empty ring is in orochimaru. It can be inferred that the ring is one of the necessary conditions for using the nine seals of magic dragon. The special significance of the ring to the members of the Xiao family: from looking for his lost ring to teddy boy claiming that he can join the Xiao family, the ring has also become Xiao. ...