Absolute control is an ability that is blessed by the heavens only to very few and as long as they are within a specified location, they would be invincible and no one could do anything to him.
Moreover, the royal family could not openly wage a war with a Viscount grade family as it would be a blatant disrespect to the heavens and it would only make them face the consequences.
As for what the Family head Pawl had to do, he knew about it very well as it was not his first time.
"Commander Gill, some people will become arrogant just because of a blessing from 'That' entity. As long as no one from the outside enters his town or makes business with the town, its rate of growth will be very slow."
"Moreover, what happens if someone from that town goes out and dies? It will only get destroyed with time….Haha."
Pawl laughed as he said his thoughts to commander Gill.