As for what was obtained,
it was a "covenant" with those Weird Demons!
Yes, the scene Zhuang Ying witnessed was not a specialty of the city but the harsh truth of the entire Dynasty, indeed, of all civilization.
The high-level figures of the Dynasty had formed covenants with Weird Demons, offering them individuals who had cultivated the Red Fire Path as fodder in exchange for peace.
To call it a covenant was merely sugar-coating it.
It would be more accurate to say that the entire Dynasty was livestock raised by Weird Demons.
The carcasses of Weird Demons could turn into Chi Yan fuel and could even aid in peoples' cultivation. Similarly, to the Weird Demons, the cultivators of this world were delicious nourishment, a resource for them to grow stronger!
And to deceive the people of the Outer City was nothing more than to make them struggle, train harder in cultivation, and become more delectable.
Even among the Weird Demons and demons, there existed restraints.