In Chapter 6, Pyra is taken by Malos, though she ensures the survival of her friends by threatening to destroy herself with Siren unless Malos and Jin left them alone. When Jin overpowers the group later, Pyra threatens to commit suicide with Siren unless Jin spares the others in return for her surrender. With how important Pyra was, and suspecting she had an ulterior motive should he force her to kill herself, Jin concedes, and once Pyra is taken into Torna's custody, Malos reveals that he intends to use her to restore his own Aegis Core Crystal that was damaged following their last fight during the Aegis War. He then painfully absorbs the energy needed to restore his Core Crystal and Aegis powers, resulting in Pyra being left an unconscious husk. Masahiro Sakurai showed pre-release material of Pyra in a YouTube video [6] and showcased several changes made before the final version: It is revealed in Chapter 7 that Pyra and Mythra originally wanted to reach Elysium to ask what their purpose was and finally be allowed to die. However, Rex still accepts them and fights Jin and Malos with resolve for them. His acceptance of them causes them to awaken into Pneuma. Forward smash: A lunging, two-handed downward slash with the Aegis Sword ablaze that ends with a fiery explosion once it hits the ground.

Pyra is the stronger Blade of the duo, dealing vastly superior damage than Mythra, but at the cost of slower movement. After sharing part of it with Rex to revive him after he was fatally stabbed, and "X"-shaped piece is missing from it, fused to Rex's chest to keep him alive. Pyra's internal codename is "eflame". Like Hero's "brave" and Mythra's "elight", it is a literal translation of Pyra's Japanese and Chinese names (minus the "e"). Pyra's P2 costume was intially too dark and its colors were brightened to be more in line with Pneuma. Telekinetically throws the opponent upward. Her worst throw, dealing little damage, not being able to KO until Sudden Death percents, and possessing no combos.To promote their release, Monolith Soft created an animation where Pyra and Mythra show their excitement in joining Smash, and ask for the viewer's support. [4]

Given time Mythra becomes more active, and is active through most of Mor Ardain. After this, she and Pyra switch readily in gameplay and story. Pyra has four alternate costumes, including the hooded cloak she wears in Torigoth, which can be obtained as DLC Aux Cores via Challenge Battle Mode. These are: Despite being known as one of the most formidable fighters in history, Pyra is a benevolent and respectful young woman who intends to bring peace among both Blades and Drivers. Pyra has a warm heart and usually acts politely, she never cares about herself due to her hatred for selfish behavior. Pyra also can be expected to be polite, which shows that she does not have a rude nature. However, she doesn't hesitate to protect her people and will do so when the people she cares for need her help. In spite of her cheery demeanor, Pyra is very weary of her past mistakes, and she resolves to amend them. According to Sakurai, he and the development team went through a lot of trial and error before settling on Pyra's design for Smash Bros. [3]Because of this, Pyra/Mythra are the respective second and third fighters whose Fighter Spirits are marked as "Name (Fighter)", due to already having regular spirits in the base game. Final Smash: Burning Sword. Pyra lends Rex her Aegis Sword and he attempts to slash any opponent in from of them. If successful, a cutscene plays where she and Rex summon a large pillar of fire under the targeted opponents. Glimmer bears a striking resemblance to Pyra, bearing an identical Core Crystal to her and Mythra. As well, her hair color lines up with the baby Pyra holds in the photo at the end of Xenoblade 3. Their victory fanfare also has an internal codename, namely "element", which is presumably what the "e" stands for. After retreating to the Titan Gormott, Azurda reverts to his larval state to survive his life-threatening injuries, and Rex and Pyra's journey soon begins as they first have to help rescue Nia and Dromarch after they are arrested as part of a trap with being used as bait to draw in Rex and Pyra. After then befriending and being joined by Tora and his Artificial Blade Poppi, and rescuing Nia and Dromarch as part of a trap set up by Mor Ardain Special Inquisitor Morag Ladair and her Blade Brighid, Rex and Pyra's journey soon leads them to meet with Vandham and his Blade Roc, but when Pyra leaves during the night to surrender to Torna as she meets with Malos and Ahkos, Rex and the others follow and come to her aid, but due to being unable to fight thanks to Ahkos and his Blade Obrona being able to manipulate the Ether flow of the area, Vandham is soon forced to effectively commit suicide to try and buy time for Rex and the others to escape.