Dontropolis

Funded by multibillionaire Dontru and built by hordes upon hordes of Skakdi and Skrall laborers using Xian machines, Dontropolis stands tall as a symbol of isolationism, Matoran dominance, and a strict no-immigration policy. The gleaming towers reach high into the sky and the infrastructure is all advanced and one hundred percent Matoran-made. Only Matoran immigrants are allowed, and only the first five thousand.

Obviously, the Skrall and Skakdi hired to build the city are allowed to stay with them. Some, Dontru assumes, are good people.