"The Only Exception" 

At first, Charles wanted to occupy the biggest fighting arena with the largest audience seats possible, but currently, there were too many on-going battles. 

Thus, he could only visit a relatively small battle arena with a few battle rings. 

This battle arena was like a large coliseum with several battle rings on the field. 

This small battle arena is usually for relatively small battles and people often used this battle arena to train and not to solve disputes. 

To solve disputes, the battle arena had their own arena...and it was all underground. 

There was only one underground arena, and from time to time, the schedule would always be full of people wanting to solve their conflicts. 

This underground arena was built like an indoor soccer stadium. 

Rows and rows of seats and a hall as big as a volleyball field were all created with the best materials to withstand various unique abilities.