Mythra is one of the main protagonists of Monolith Soft's Xenoblade Chronicles 2, the third entry in the Xenoblade Chronicles series and playable characters in Super Smash Bros. Ultimate.


Mythra is a Blade, which are personifications of weapons used by Drivers. Mythra specifically is the Aegis II, a legendary blade with light elemental abilities. Addam, central character of Xenoblade Chronicles 2: Torna ~ The Golden country, and later Rex, the protagonist of Xenoblade Chronicles 2, become the Driver to Mythra and their life forces are connected. If either were to die in combat, the other were to die with them.

Addam, prince of Torna, is confronted by Amalthus, an ancient being, and asked to be the drive of Aegis. Addam accepts and awakens Mythra, and their life forces are combined. The two would battle against Malos, the antagonist of Torna ~ The Golden Country, in a series of events that would come to be known as the Aegis War. The war came to a head in a battle where Malos tricks Mythra into unleashing her full power, which Addam is unable to control. Malos is injured, but the city of Auresco was destroyed and many lives were lost. Stricken with grief, Mythra spontaneously transforms into Pyra, splitting her personality. Seeing no other way to protect Mythra, Addam puts Pyra in stasis inside the Ancient Ship and sinks it under the Cloud Sea until someone that is able to control her comes along.

While Pyra awakens 500 years later, Mythra remains hidden for a while longer. She only forcibly awakens after Rex and Pyra have a near death experience at the hands of Obrona, a secondary antagonist. Mythra tells Rex off for pulling a stunt to awaken her, and Pyra apologizes for the actions of her other half. After a while of reluctantly allowing herself to used in battles, Mythra becomes more open and willing to work with Rex, and the two eventually learn to swap between each other during a battle.

The party learns that Malos, another antagonist, requires Pyra's memories to regain his lost powers. Pyra offers herself in exchange for the safety of her friends. After her memories were taken, Pyra becomes unusable as a Blade, but suffers no physical effects. The party comes to rescue Pyra, with Rex fighting without the Aegis due Malos taking his powers away. Pyra and Mythra urge Rex to flee and leave them to die, but he refuses, saying that he is still their protector and will take them to Elysium. The sheer amount of willpower Rex displays causes Pyra and Mythra to merge together and form Pneuma, the ultimate form of Aegis. The party then confronts Malos and kill him in a final battle. Pneuma sacrifices herself to save the party from the collapsing world tree, dying in an explosion. However, after the rebirth of the world, the core crystal of Aegis glows again. Rex touches it and Pyra and Mythra appear in separate bodies. It is left ambiguous if the two retained their memories from their previous life.

Super Smash Bros. Ultimate

During Ultimate's development, Masahiro Sakurai had considered adding characters from ARMS and Xenoblade Chronicles 2, however as their games were announced long after development had started, he passed them over. 3 Years later, Mythra would be announced as the tenth DLC fighter alongside Pyra in the February 17th, 2021 Nintendo Direct. She will be released sometime in March 2021.


  • The artwork for Mythra's spirit is slightly altered from its original appearance, adding clothing to cover up her cleavage and legs; this was likely done to avoid raising the game's age rating, as Xenoblade Chronicles 2 has a higher age rating than Ultimate in most regions. Prior to Ultimate's release, this edited design was added into Xenoblade Chronicles 2 as an optional costume for Mythra. The artwork with her optional costume was later used as a basis for her design as a fighter.