One of the mainstays of the Eberron setting is the idea of communities, both inclusive/organic (settlements, cities, organized religions) and exclusive/artificial (secret societies, cults, criminal gangs). In the 3.5E rules, the Eberron Campaign Setting book introduced the Community domain for clerics, designed for a cleric to encourage group effort. The one saint in the canonical material that characters can actually meet is devoted to this domain.
This is my attempt to convert the essence of the 3.5 domain to 5E. There's not much too the 3.5E domain: just a list of spells, a diplomacy bonus, and calm emotions once per day. 5E domains are far more defining and grant far more power than that. I worked this one from the ground up, with some help from a few ENWorld commenters.