City Spirits

Beings; Magic
See also: Spirits of DC

Most (or all?) cities have city spirits. This includes lesser spirits, each with a domain as small as a neighborhood or even a park. A city typically has one greater spirit, with whole city as its domain.

According to many paradigms, a city spirit comes into being through the shared beliefs and emotions of the residents. The nature of those beliefs and emotions influences the personality and activities of the spirit. Founders and civic leaders can be especially influential. Notorious individuals and groups can also be highly influential. For example, Los Angeles is influenced by Hollywood, Detroit by the auto industry, and Chicago by Al Capone and his Chicago Outfit.

Home Domain

It is wise to not underestimate a spirit in its home domain. The spirit's relationship to their domain is often very powerful and difficult to disentangle. In at least some paradigms, the spirit exists because of the domain, so as long as the domain exists, the spirit may be essentially immortal. The spirit often also has extraordinary awareness of the past and present of their domain, down to the smallest details. They may even have awareness of the future, or perhaps the most likely of possible futures.
All of this is true for the least of spirits to the greatest, from a dryad and their tree to a city spirit and their metropolis. Some see this as a special case of the Law of Harmony: likeness is sameness. Even a god may not be assured of success when trying to act against the wishes or values of a spirit, while that spirit is at home.
-Advice for Transplanar Hunters, Ajami Rao

Sigil

Sigil is a focus on endless debate among experts on city spirits. Is the Lady of Pain the spirit of the city? If not, what is the spirit and what is its relationship to the Lady? Could the Lady prevent a spirit from existing, or at least moving freely?