Mercenaries have worked all across Immorren ever since the old Warlords era, when the nations known as the Iron Kingdoms of today were still far from forming. It is even argued that their defeat of the Molgur tribes lead to the Thousand Cities Era, during which mercenaries experienced a "Golden Age" throughout Immoren.
During this era, a set of legalities known as "the Charter" came into being, and its rules and strictures clarify the legalities and expectations of hiring mercenaries to this day. The Charter includes rules for treatment of employers, claiming territory and dividing loot, among other things. Every mercenary outfit is obliged to declare allegiance to the Charter in order to legally solicit work, and companies that breach or ignore the Charter are often hunted down as criminals. Mercenary companies also have individual charters, and those without one or in violation of one can be fined or even disbanded. These charters often detail what objectives are eligible, and outline day-to-day operations as well. Some kingdoms have long relationships with specific mercenary companies to the point that they are considered semi-official parts of the client's standing army, though many mercenary companies also flat-out refuse to work with certain kingdoms. Mercenaries come from many lands and come in many forms from the dead, to elves and the dwarven people of Rhul . Mercenaries also have a wide array of unique skills that may not be available to the standing armies of the kingdoms, and thus many individuals and mercenary outfits make use of exotic weaponry.