Killing the rest of the demons and monsters that formed that black cloud took quite a bit of time. Purely using Non-Phase Sword Defense against those scattered and fleeing monsters and demons seemed a bit inconvenient. However, Wang Lu, stemming from all sorts of considerations, did not use the skill that he acquired from the Sword Demon in Ancient Sword Tomb. In fact, he didn't even consider using his original magical ability. By purely using the countershock ability of his Non-Phase Sword, as well as his extraordinary speed, one by one, he overtook and killed those group of demons and monsters in the sky.
However, the good thing was, when he finally got rid of this group of demons of monsters, he needed not bother to find their stronghold—the second round of the plot has been opened.