A wall of eerie mist was approaching the town. If not for the purple and blue glow of it, it would've melted with the evening—but most people didn't see that glow.
From my vantage point on a nearby hill, I could see how oblivious the soldiers on the town's walls were to it. Only when the mist almost reached the walls, they started to show confusion and slight alarm.
Too late, and ultimately pointless.
The wave of three thousand wraiths reached the walls, and in an instant, the screaming began.
Then panic, more screams… It lasted a while.
The wraiths, obeying their orders to the letter, killed every Crystal Phoenix Sect soldier and cultivator they saw, then surrounded it in a circle. They didn't attack the civilians, but whoever tried to break the circle fell dead after a second or two of agony.
After an hour of this, most people stopped trying. The town's resistance was utterly broken, and anyone could move in and take it now.