From publisher blurb:
They are known by many names. Freelances. Soldiers of Fortune. Privateers. Ironmongers. At the end of the day, though, no matter their heraldry or honor codes, their reputation or their legends, these so-called adventurers all boil down to one thing... mercenaries. While many of these sellswords operate independently, moving from one paymaster to another as the mood and desire strikes them, others have banded together to form free companies of warriors. Often possessing unique skills, specialized training or assets not available even to the standing forces of city states, merchant houses and powerful guilds, these swords-for-hire are as varied as they are dangerous.
This supplement contains ten unique mercenary companies found throughout Sundara, detailing their histories, providing sample members to act as NPCs and giving the GM rumors to help build up their reputation and act as jumping off points should they wish to include these free companies in their games. Lastly, every free company listed in this book comes with an archetype for players who want to embody the unique skill set, training and special abilities associated with these particular sellswords. Though it should be noted that these companies are made up of various individuals with a variety of roles, so it is not necessary for one to possess this archetype in order to be (or have been) a member of one of these companies should a player simply want to use a given mercenary company as a feature for their character's background.
Lastly, membership in a given mercenary company is not required for a character to take any of the archetypes listed here. While that is the easiest story explanation for their class features and abilities, it is not the only one. An individual may be a former member of a company, for example, or have been trained by someone who was once a former member. Players and Game Masters alike are encouraged to be creative with these options in order to make them as available as possible in their games, should you wish to use them.