Eberron Campaign Setting by Wizards of the Coast

A richly detailed campaign world that blends pulp action, noir intrigue, and high magic on a war-scarred continent where the aftermath of a century-long conflict shapes politics and adventure. It presents distinctive elements—living constructs created for war, powerful dragonmarked houses that dominate commerce and magical services, magical technologies like lightning rails and skyships, and mysterious phenomena such as the blasted, enigmatic Mournland—and supplies nations, factions, organizations, and hooks for espionage, exploration, dungeon delving, and planar mystery.