All of this was simply because of its dread of the human world and its vigilance against the possibility that Huo Yuhao, after ascending to the God Realm, might expose the existence of the Silver Dragon King.
There was also that speculation whispered by Demon Lord.
"If that human wants to fuse all powers together perfectly, there is only one way: kill the Sovereign, and use the Sovereign's Soul Ring as that human's tenth Soul Ring."
Chapter 939