A perpetual fog of heavy rain sadly hangs over the houses of Ravnica.Citizens go about their daily business in bustling and shady alleys. Through it all, ten guilds - criminal syndicates, scientific institutions, military forces and more - live for power, wealth and influence. These guilds are the foundation of power for Ravnica. They will exist for millennia and each has its own identity and function, its own variety of races and its own distinct subculture. Their history is a web of wars, intrigue and political machinations as they have taken control of the plane.