Duke Zhou Yanhu knew that this was the only way to make the Advanced War General Peak Destroyer in front of him spare his life.
In Duke Zhou Yanhu's opinion, if Dong Lei was not a Divine level expert, he was also comparable to a Divine level expert.
With such terrifying strength, Duke Zhou Yanhu believed that he could not leave this place.
Moreover, if he did not obey and swear to serve the man for the rest of his life, he would definitely be killed on the spot by the Advanced War General Peak Destroyer in front of him.
In this world, once one swore, it could not be changed.
Unless the person whom he swore to serve removed it, he would not be exempted.
Otherwise, as long as the master had a thought, the servant's body would disintegrate and they would die.
In front of Dong Lei's game interface, the validity of Duke Zhou Yanhu's oath appeared.