Lu Ban placed the cat into a jar and sealed it.
"This cat seems to be able to usurp a person's mind, making everyone helplessly fond of it, wanting to possess it, to protect it. If used against the insects, I reckon all the insects will gather around it."
Lu Ban assessed.
If the insects each had an independent will, then it would not be possible to capture the hearts of all the insects with just one cat.
But the insect swarm in the Wasteland is a whole entity, so as long as one insect sees the cat, it means all the insects have seen the cat. They will definitely converge on the cat, ultimately allowing Lu Ban to catch them all in one fell swoop.
It could be considered an insect trap.
Struggling meows came from the jar; Lu Ban was somewhat tempted, but he still used another jar to encase the first one, completing the nesting of jars and isolating the sound.