Theory
Theory is a Rare Blade featured in Xenoblade Chronicles 2, designed by guest artist CHOCO. Wielding a katana in combat, she commands the Ice element and specializes in a Defense role. Originally bound to a Driver involved in Core Crystal hunting, she later becomes available to resonate with the player's party upon completing a specific Blade Quest. Characterized by her cool demeanor, she forms a deep, sisterly bond with her companion Blade, Praxis.
Overview
Theory is a Rare Blade featured in Xenoblade Chronicles 2, designed by guest artist CHOCO. Wielding a katana in combat, she commands the Ice element and specializes in a Defense role. Originally bound to a Driver involved in Core Crystal hunting, she later becomes available to resonate with the player's party upon completing a specific Blade Quest. Characterized by her cool demeanor, she forms a deep, sisterly bond with her companion Blade, Praxis.
Appearance
Theory has light blue short hair styled into a single bun, blue eyes, and wears an eyepatch over her left eye. She features a sharp, ice-themed outfit designed in contrast to her companion Praxis. On her head, she bears a sharp ice-like horn ornament, which is detachable.
Personality
Theory possesses a calm, cautious, and somewhat reserved demeanor, occasionally displaying a slightly sharp tone. Though initially aloof towards others, she undergoes emotional growth by attempting to atone for her past deeds, eventually learning to open up and show warm affection to those she holds dear.
Abilities
In battle, Theory wields a katana to execute ice-elemental attacks, combining physical and ether defense with high evasion. Her specials include Weiss Slash, Frostig Vanish, Schwester Rebellion, and Glänzen Winter. She can perform counterattacks upon dodging, resist Break status, and utilizes field skills such as Ice Mastery, Focus, and Nopon Wisdom.
Background
Originally bound to a bandit named Oswald, Theory engaged in Core Crystal hunting alongside her partner Praxis. After Praxis returned to her Core Crystal during a battle, Theory sought to help her regain her lost memories. When Oswald later ordered her to kill the re-awakened Praxis, Theory turned against her Driver, slaying him before reverting to a Core Crystal herself. Upon being re-awakened by the protagonists, she embarks on a journey to atone for her past misdeeds.
Relationships
She shares a close, sisterly bond with Praxis, whom she affectionate calls her big sister after re-awakening in Rex's party. She was formerly bound to the Driver Oswald, whom she betrayed and killed after refusing his ruthless orders.
Trivia
Her Japanese name, Seori, is derived from Seoritsuhime, a Shinto goddess associated with water and purification. According to character designer CHOCO, she and Praxis were originally envisioned as a single Blade concept before being split into two distinct characters during development.
