In the past, there was only one way for people to break into those big cities, which was to fight with consumption. They would dispatch a large number of big celestial devices and cultivators, and then consume some big celestial devices and cultivators to open a hole in the city's protective shield and attack it by force. However, there was a premise, which was that the difference in strength between the two sides was very great.
Take Fan family as an instance, Ji family had almost crippled Fan family; however, they failed to conquer the main city of Fan family. Finally, Fan family escaped the catastrophe. It was evident how important the main city was for a clan.
