Bab 229: In The Ring.

Yang Dao came to an arena under the lead of Lin and the rest. After winning the chess match he has been asked to change his clothes to a more sporty attire and meditate to adjust his mental state. He complied with their instructions and changed his clothes. He selected a generic-looking white t-shirt and black lowers along with white shoes. 

The rules of the Elemental Duel were as such. The contenders are not allowed to carry external weapons and must be searched before the battle. They must not wear any defensive armor. The meaning of elemental duel was to compare the strength you can generate using the element you practice in.  Your attacks can fight with your physical strength as well. However, in front of elements, the human body falls short.