User blog comment:Loretracker/What would happen to E-Rantel?/@comment-59.191.194.34-20160229030236/@comment-59.191.194.34-20160229110610

The cultivation part meant the area surrouding E-rantel. I think most likely he will employ the goblin army as a border/ security patrol.

Plus, Ainz does not require Momon to run the city as most of the ruling class likely remained. He could have just form a council consisting of the mayor and the leaders of the guides, that will take orders from him while keeping them under close observation.