Tactical Fairies are support units that assist the Echelon during combat. They're seen as UAVs hovering above the team. Getting them requires from the Large Equipment Craft.
Tactical fairy system
Serve as the 6th man of the team, they providing all sorts of combat buff or support. Each usage of their skill consumes "Support Order" which can be seen in the map, it gradually regenerate overtime. They also had a 2nd ability known as "Talent" which triggers randomly and it's buff affect the team during combat. This can be Calibrated/change skill.
Tac-Fairies can increase level during combat.
Each Fairy had a fixed skill. Which can be increase via training.