The Jiuzhou Continent is divided into nine regions, and the place where Yunmeng Pavilion is located is called Yunzhou.

Yunzhou has hundreds of Dark Cities, which are classified into three levels based on their size and scale.

The Dark City near Yunmeng Pavilion is the smallest, called a Bronze-level Dark City, or simply Copper City.

Above that are Silver-level Dark Cities, referred to as Silver City, and Gold-level Dark Cities, known as Gold City.