Building a city wasn't as simple as stacking matchboxes; it wasn't just a matter of drawing a plot of land and then encircling it with four tall, smooth walls to call it complete work.
In Dayan, such an undertaking could, at most, be considered a stronghold.
From the initial planning and civil engineering project proposals, various kinds of technical expertise were needed.
From the basic urban planning, to the intersection and separation of the Beast Path and ordinary roads, to the complex underground water supply, drainage, and storage systems, many affairs required the use of technology—over a hundred types, large and small.
Moreover, these were just the mundane theoretical technologies; the bulk lay in the Formation Patterns.
A city's construction required thousands of different Formations, large and small.
That's why these large-scale construction projects usually involved several or even dozens of different industry trade guilds sub-contracting and undertaking the work.