At this moment, it would be possible to forcibly disrupt the formation by eliminating the mini-devils, but it might cause the mini-devils to counterattack your descendants, and a slight carelessness might result in their death.
But if you wait for 49 days to pass, this formation will break on its own, and the mini-devils, denied sustenance, would also counterattack. So, you may consider whether to disrupt this formation now. The key point is that actions eliminating the mini-devils have to be swift..."
"Is there no other more secure way? If not, what's the use of keeping you around?"
"No, no! There is, there is one more way. These mini-devils are fueled by deep resentment, which we benefited from by using your dependent's grudge towards your absence from home.
If this resentment could be removed, the mini-devils, devoid of resentment, will become less hostile and the speed and intensity of a counterattack would decrease..."