Very Early concept art of how the 3 powers are displayed in the UI
Fairies rely on 3 principal powers in order to survive out in the wild.
Fairy Power is the basis of most of a fairy's non-magical, physical abilities. It's akin to their health, strength, lung-capacity, &c.
Wing Power is the basis of a fairy's flight, but also for their source of their ability to produce Erogel, and is akin to their Stamina and Willpower.
Quiver Power is the basis of a fairy's ability and willingness to seduce, and is akin to their morale, .
All 3 powers contribute to a Fairy's magical abilities (See: Magic),
If any one power is depleted, the rescue teams are called in, to teleport the fairy back to town.