C827 Troika

"Modify the system's rules?" Yang Yu's mind flashed, "What are the rules of the Ultraman Summoning System and the Monster Summoning System?"

Tian Xiong did not know what Yang Yu wanted to ask, "There are a lot of rules in these two systems!"

Tian Xiong immediately showed the rules of the two systems to Yang Yu through the World Law System.

Yang Yu smiled when he looked at it carefully