Otherwise, how could he know the unique martial art of transforming qi and blood into silk?
As for Zhuang Shisan being the one who killed Zhao Xing, Xu Mao didn't even think about it.
Zhuang Shisan was a Divine Power Realm martial artist who could kill Elder Zhao Wuji, and the person who killed Zhao Xing was only a Visceral Tempering martial artist.
It was only a few months apart.
In just a few months, he could reach the point of beating Elder Zhao Wuji to death from the Visceral Refinement Realm?
That was impossible!
"Elder Zhao Wuji was beaten to death by Nanyang Zhuang Shisan, when has my Ten Thousand Poison Sect ever been provoked to such an extent?"
"I will definitely take revenge!"