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Theory is a Rare Blade in Xenoblade Chronicles 2. She can grant tremendous power to her Drivers, Rex, Nia, Zeke or Mòrag, and their allies. Theory uses the ice element, wields a Chroma Katana, and acts as a Tank in battle. She moves as a skater on ice with an elegance reminiscent of a fairy, similar to Praxis, a female Blade with whom Theory shares a bond.

Blade Specials

  • Lv. 1 - Ice Slash - After throwing ice knives, attack with slashes.
  • Lv. 2 - Frost Banish - Release a powerful somersault kick after three repeat attacks.
  • Lv. 3 - Rebel Sister - With one slash, smash an ice pillar and attack enemies over a wide area.
  • Lv. 4 - Winter's Wake - Hurl out continuous ice strikes to freeze the enemy in their tracks.

Blade Arts

  • Accuracy Up - Increases accuracy.
  • Nullify Reaction - Nullifies one reaction.

Battle Skills

  • Aerial Flashdance - Counters attack with physical damage.
  • Conviction - Increases damage dealt to enemies targeting user.
  • Steadfast - Boosts Break resistance.

Field Skills

  • Ice Mastery - Lv. 3
  • Focus - Lv. 3
  • Nopon Wisdom - Lv. 3

Affinity Chart

Favorite Items

  • Pouch item types: Veggies, Board Games
  • Pouch items: Steamed Veg Stralu (Veggies), Sparkly Snow Perfume (Cosmetics)

As an Enemy

Theory is first met as a quest-exclusive Blade boss during the "Crystal Clear" quest, where she is refered to as Plunderous Theory. She is fought at level 33 on Obra Street in Torigoth alongside Piratical Praxis. She is fought a second time at level 48 as a quest-exclusive enemy during the "Pest Control 3" quest where she is refered to as Mediator Theory, alongside a group of Cherys Medooz in the Lud Cloudway: Fonsett of the Leftherian Archipelago.

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