You see how strong the Heavenly Sect Master is; even with an Immortal Slaying Sword Formation sweeping away ancient enemies, he still couldn't kill other Saints.
To put it another way, during the Investiture of the Gods War, though four great Saints broke the Immortal Slaying Sword Formation, the Heavenly Sect Master merely retreated and had no danger to his life.
Thus, a Saint cannot kill a Saint; this is an unchanging iron law throughout the ages.
Of course, all things mutually reinforce and neutralize each other, so nothing is absolute. Even Saints may not truly be undying, but to kill a Saint is certainly not so simple.
Ever since Ye Xuan passed the Heavenly Dao Three Tribulations, he has been pondering this issue.
Kill Saints!
