Many collegiate societies revolve around a university campus and even the exceptions have developed specialized equipment for speeding the acquisition, distribution and protection of knowledge as well as the comfort of the scholars who produce it.

The great advantage of an Imperial society is the ability to do things like infrastructure at scale, freeing up citizens of the empire to specialize. But that scale also typically comes with bureaucratic hierarchy, need for communication, and the drafting of residents to help during times of trouble.

The tangle of bridges is a loose and evershifting thing, a burgeoning society built from emergent intellect and ancient ancestral claims, all developing just underfoot. Trolls have always staked out their territories, vying for the best hunting grounds or hollows under the most traveled pathways. Over time these territories have become a network of lairs, communities, and markets, and the routes between them, collectively known as the Underbridge.