Of course, what the Poison Ancestor truly feared was not the Immortal Extinguishing Sword, for after all, he was a Quasi-Saint, and the Immortal Extinguishing Sword was merely one of the Four Immortal Slaying Swords, which could hardly harm him.
What truly made the Poison Ancestor apprehensive was the Immortal Slaying Sword Formation. Like many others, he suspected that Ye Xuan possessed the Immortal Slaying Sword Formation. If Ye Xuan indeed came wielding it, then he would retreat significantly.
Moreover, no matter what, with a Heavenly Sect Master backing Ye Xuan, although the Poison Ancestor seemed intent on killing him, it was mostly a show of menace. At most, he would heavily injure Ye Xuan, but never take his life.
"Sword rise!"
