Unique to the Gaia warrior class jobs, a spiracle orbits your character and is used to store energy. The Spiracle Charge skill allows you to convert MP into a spiracle. The skill Spiracle Mastery determines how many spiracles may be kept in orbit around your character.
Certain attack and buff skills allow the energy stored in a spiracle to be exchanged for an instantaneous benefit or for a benefit that lasts a short duration.