Breakthrough to the middle stage of Battle King

Ethan Xiao brought Little Dold Lion to the Tianzi Guest Room where they rented, which was a relatively spacious courtyard.
Walking into the courtyard, Ethan Xiao took out the room card. In an instant, the room card trembled slightly and turned into a stream of light that shot into the ground.
Immediately afterwards, there was a tremor all around, and a strong spiritual energy of heaven and earth rushed towards them. It was obvious that there was a small formation in this courtyard that gathered...