The City of Lives
The City of Lives is a crosspiece between innumerable realities, a metropolis with links to more realms than atoms in the ocean. Men, animals, and things that are neither, have traveled to and from the City for millennia, and they have all left their stamp on its inhabitants. There are virtually none that can claim pureblood humanity now living in the City, instead Bloodlines have formed, claiming heritage from everything from beasts to undead barbarians.
A City of Lives campaign can encompass many things: becoming embroiled in the labyrinthine politics and occasional urban warfare of the titular City; traveling across the realms to explore a multitude of different worlds; or venturing into the wilds of the Realm of Lives to defeat the many threats to the City.
See the Wiki