Pneuma is Pyra and Mythra's ascended form. She is the combined true form of Pyra and Mythra, merging both of their personalities into one.

As the embodiment of the true power of the Aegis, Pneuma is capable of rewriting the physical rules of her surroundings, resulting in all type of feats, from light-speed movement to slowing down time itself.

Amalthus searched for a Driver capable of awakening Pneuma's Core Crystal and stop Malos. Addam, the Hero of Torna, eventually awakened Mythra. During Addam's final battle with Malos, Mythra awakened a portion of Pneuma's power. Addam could not control her true power, and the ensuing destruction led to fall of the Kingdom of Torna. Upon seeing the destruction, he and Pyra, who Mythra created due to her fears of causing more tragedy, sealed Pneuma's Aegis Sword away deep inside of Spirit Crucible Elpys. He then tasked Azurda with guarding Fonsett Village, home to the entrance of Elpys. Pyra was then placed in stasis aboard a Tornan ship, and was sunk deep within the Cloud Sea.

Five hundred years later, Rex inadvertently touches Pyra's sword, becoming her Driver, and is slain by Jin in response. Meeting in Pyra's dream of Elysium, Pyra offers to revive Rex by giving him half of her Core Crystal in exchange for him taking her to the real Elysium. Once Rex is revived, the two combat Malos and eventually escape.

After Jin defeats Rex and takes Pyra at the Genbu Crown, King Eulogimenos mentions the Tantalese book containing evidence of the third Aegis Sword. Azurda then leads the party back to Fonsett Village and inside of the Spirit Crucible Elpys. At the Vault of Heroes at the end of Elpys, endless Phantasms of Addam challenge the party. Addam's spirit recognizes Rex as the man he has been waiting for and talks to him in a vision of Elysium. He mentions that in order to become Pyra and Mythra's true Driver, Rex must take on all of her burdens. Pneuma's sword is then presented to Rex. After he touches it, he receives a brief vision of Klaus's experiment before the sword vanishes from his hand.

The party eventually confronts Jin and Malos at the Gotrock Oracle Ruins on the Cliffs of Morytha, where Malos hands over an unconscious Pyra. Rex and the party attempt to fight the duo, though Pyra and Mythra beg Rex to give up and reach Elysium without them. Rex claims that he won't break his promise, and after a brief vision of the Aion Hangar, he summons the third Aegis Sword. Pyra then reawakens as Pneuma and gives Rex a similar outfit to hers.

Pneuma's power allows her and Rex to match speeds with Jin and easily take him down. Malos then summons Ophion, and Pneuma summons Siren in response. A battle between the Artifices destroys the cliff and sends the party and Jin beneath the Cloud Sea to the Land of Morytha. Pneuma uses her power to temporarily heal Jin and discovers that he is a Flesh Eater. Afterwards, she opens the path up to the World Tree, though she claims it was instinctual.

Upon reaching the exterior of the World Tree, Amalthus uses Fan la Norne's Core Crystal to control Mythra and the Titans into attacking Torna and the World Tree. With the help of Poppi, Pneuma uses her power to destroy Indol's amplification towers. She later uses her power to help the party battle both Jin and Amalthus at Megrez Gateway.

As the party meets the Architect, he reveals Pyra and Mythra's original name to be Pneuma. He reveals that upon seeing that the humans on Alrest were no different from the past, he lost faith in the world. For this reason, he did not stop Amalthus from taking Pneuma and Logos back to Alrest. However, he reveals a change of heart after seeing the unique bond between Rex and Pneuma and gives Pneuma all of Elysium's authorizations. He explains that the Aegises draw their power from the Conduit and that with his other half's death, the Conduit will disappear, leaving Pneuma powerless. The party then goes to stop Malos.

Rex and Pneuma are able to defeat Artifice Aion and Malos by using Infinity Blade. The attack damages Malos's Core Crystal, and he soon dies. With the Conduit's disappearance, the space elevator begins to break apart, meaning the World Tree would collapse onto Alrest. Pneuma tells the party that a control room that could activate rocket boosters to prevent this. This ends up being a ruse; Pneuma must use the last of Artifice Aion's power to destroy the World Tree. She convinces Poppi to not help Rex come with her and gives her Core Crystal to Rex so that he may live on. She also allows Azurda to return to his Titan form so that the party may survive the journey back to Alrest. As the party escapes, she reactivates Aion and is seemingly killed in the explosion, but not before thanking Rex for having a major presence in her life. However, Rex is able to reawaken Pneuma's Core Crystal, reuniting with Pyra and Mythra.

Measurements

• Height - 163cm or 5'4"

• Bust - 28FF

• Waist - 62cm/25

• Hips - 94.5cm/38