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Plot

When the aque blastia core is stolen from Zaphias's lower quarter, denying water to the lower class that lives there, Yuri attempts to chase down the thief, but is arrested and jailed in the castle. He escapes and flees with Estelle, after discovering that she is searching for Flynn. The two, along with Repede, chase after both Flynn and the thief. They meet Karol and Rita, who takes great interest in Estelle's healing artes. The group is able to catch up with the thief, and, with Judith's help, recover the blastia, thwarting the plans of an evil guild leader, Barbos, in the process. Yuri then turns it over to Flynn to return to the city. As the group recovers, Rita discovers that Estelle does not actually use her bodhi blastia to cast healing artes. Estelle soon comes to learn that she is the Child of the Full Moon, and an omen of an impending disaster upon the planet.

Judith leads the group to the home of the Kritya, who explain that the Child of the Full Moon, if used as a tool, could bring forth the Adephagos, a being that feeds off aer and would convert all life on the planet back into pure aer due to their use of blastia; the group is encouraged to kill Estelle as soon as possible to prevent this from happening. As the group comes to terms with the revelation, Raven, revealed to be the Imperial Knight Captain Schwann Oltorain, kidnaps Estelle and takes her to Alexei. Alexei is able to take control of Estelle's power, and uses it to reveal the Enduring Shrine of Zaude before the group can save her. Raven has a change of heart and regroups with the team as they chase Alexei to the Shrine. Before Yuri can kill him, Alexei activates the huge blastia at the top of the Shrine, causing the Adephagos to break through a magical seal and send tentacle-like appendages across the planet. Alexei then commits suicide, realizing the folly of his ways. As the group recovers, Duke appears and states his intention to help destroy the Adephagos and save Terca Lumireis by sacrificing the life essence of all humanity, including himself.

The group comes up with a strategy for stopping the disaster, but at a cost: by creating spirits of the elements from the four Entelexeia (Belius, Phaeroh, Gusios, and Khroma), they will be able to convert all the blastia cores within the planet to an energy weapon, the Dein Nomos, that can destroy the Adephagos. The group decides to push forward with the plan and work their way through the tower of Tarqaron, a gigantic, hidden city-turned-weapon underneath Aspio that Duke activated, meeting Duke at the top. The group is able to defeat Duke, and Yuri attempts to convince him that all humans are willing to give up blastia to stop the Adephagos. Duke recognizes Yuri's honesty and assists the group. The combined power of the Elemental Spirits, the converted blastia cores, and Dein Nomos slices the Adephagos in two and destroys it.