Didn't he still die from his own sneak attack?
Cultivation level and talent are one thing, real battle experience is another.
As long as you use the right method, you can still kill an opponent with a higher cultivation level than yourself.
Shangguan Zhao'er was still struggling desperately, but the corpse poison was eroding her body. If she couldn't remove the corpse poison from her body, then as the Yellow Springs Sect's Supreme Elder said, she would soon be reduced to bones.
Whether Shangguan Zhao'er could remove the corpse poison with her own True Qi was yet to be seen, and the three Supreme Elders of the Yellow Springs Sect wouldn't give her the chance to detoxify.
"You two use Talismans to protect yourselves, I will deal with them,"
Seeing Shangguan Zhao'er poisoned, Lu Changsheng, holding the Slaying Immortal Sword, rode the Demon-Suppressing Sword up into the air.