Zhang Yi was very confident because he knew how Emperor Realm and Divine Realm elders thought it was important to use the laws during fights, most of the techniques the strongest elders use are with the laws and not techniques like the ones Zhang Yi used that depended on the weapons.
So if Zhang Yi faced the Divine Realm elders and used the divine domain dominion technique against them and used his peak understanding in all laws, the Divine Realm elders would surely have more than 60 percent of their attack power reduced.
With the techniques of celestial armor and the chaos shield, it would be hard to imagine any attack affecting him, not to mention the holy rank spear and dragon scales that increased his defense by 7 times.
