The Mercenary Camp is unlocked during the fairy chapter.
The first two units it offers are also available in the fairy chapter. The Blossom Mage is available to be trained right away, and shorty after unlocking the Mercenary camp, the drone rider can also be researched.
Additional units become available for research in later chapters.
Use the "Next" and "Back" arrows to page through the tabs and see more about each unit trained in this building.
A fast and strong fighter, the Drone Rider has huge attack and defense bonuses against Light Ranged Units.
Light Ranged Units
Heavy Melee Units
Heavy Ranged Units