chapter 391 Lord of Thick Earth Palace?

The middle-aged puppet took Russo Su and flew rapidly towards the depths of the Sky Palace.
The two flew past palaces, buildings, and mountains, and soon they landed in front of an ancient palace.
Russo Su looked up and saw four ancient characters "Hou Tu Shen Tang" above the palace gate.
These four big characters are written in a majestic and powerful style, giving people a sense of heaviness and vicissitudes.
"Senior, where is this place?"Russo Su was puzzled, not knowing...