Ravnica

Ravnica is a worldwide cityscape; an ecumenopolis consisting of a patchwork of grand halls, decrepit slums, and ancient ruins, with layer upon layer of stonework. Law magic and the metaphysics of hierarchy are deeply woven into the very fabric of the plane, enabling cooperating leaders to achieve feats of greatness.   Of the world's countless civic centers, one looms large above all others: the City of Ravnica, a metropolis so vast that its name has long since become synonymous with the entire plane. Centuries of Ravnican business—powered in many cases by Izzet boilerworks and other guilds’ foundries—have saturated Ravnica’s atmosphere with all manner of industrial pollution.The city and plane of Ravnica had been ruled by the Ravnican guilds and governed by the Guildpact for more than ten millennia.   Ravnica has two moons. While much of its surface is urbanized, subterranean oceans exist.   Without the Guildpact, order and structure would crumble and the entire plane would collapse in on itself. As many entities that work to maintain and protect the Guildpact there are many who see it as a problem to their own paths to power.   Which side do you stand on? The side of the Guildpact? Or with the ones who want to destroy it and cast Ravnica into darkness and chaos.   Note: This is not a wholly original setting and so a lot of what is here is from Wizards of the Coast. It is however, my spin on the setting.