The structure of a Nox city, wasn't it quite curious?
These people who never got along with each other even when they did, just how could they live cohesively in an area without problems?
The answer was that they didn't.
It was regular for conflict to overtake an entire city as the Nox fought amongst themselves, but because Higher Nox were valuable, they weren't allowed to kill wantonly.
There were two mechanisms in place to make sure they followed the rules.
The first was a battle arena. A life-or-death stage that was supervised by nine revolutions Nox and would allow one to kill their enemies existed in every city, but there were several restrictions on its use so it couldn't be abused.
The second was a collection of Supremes. They acted as a deterrent force and the highest level of authority that kept the people in line through fear.