Xenoblade Chronicles 2 Theory Guide: How to Unlock the Rare Blade

How to Get Theory in Xenoblade Chronicles 2

Unlocking the Rare Blade Theory in Xenoblade Chronicles 2 requires completing a dedicated questline rather than relying on random Core Crystal resonance. If you are looking for a reliable method regarding Xenoblade Chronicles 2 how to get theory, you must first obtain her sister Blade, Praxis, and progress to Chapter 7 of the main story.

Because her acquisition is tied to specific story milestones and prerequisite Blade quests, Theory cannot be obtained before Chapter 7.

Prerequisites to Unlock Theory

Before you can begin the quest to acquire Theory, you must fulfill several strict requirements involving Praxis:

1. Awaken Praxis: You must first obtain and awaken the Rare Blade Praxis. This process begins after Chapter 4 or 5 by purchasing the "Core Crystal hunters" info from an informant in Torigoth while carrying at least 10 Core Crystals in your inventory, which triggers her introductory questline.
2. Story Progression: Progress the main story to Chapter 7.
3. Praxis's Affinity Chart: Raise Praxis's Key Affinity to Level 4 and unlock her Fierce Deluge Level 3 skill on her affinity chart.

Step-by-Step Unlock Guide

Once you have met all of the prerequisites, you can begin the quest to obtain Theory's Core Crystal. Follow these steps to complete the process:

Completing the "Blade-sharp Memory" Quest

With Praxis's affinity chart updated and Chapter 7 reached, travel to the Royal Guard Barracks in Fonsa Myma, Kingdom of Uraya. There, you can accept the quest Blade-sharp Memory.

This quest cannot be completed peacefully. It culminates in a mandatory, challenging battle against a Level 53 boss. Ensure your party is properly leveled, geared, and prepared for combat before attempting the final stretch of the quest. Upon defeating the boss and finishing the quest, you will be rewarded with Theory's Core Crystal.

Theory's Stats and Combat Profile

Theory is the second of the sister Blades in Xenoblade Chronicles 2. She is an Ice-element Tank Blade who wields a Chroma Katana in battle, making her an excellent defensive option for your party's drivers on the Nintendo Switch.

Base Attributes and Modifiers

• Element: Ice
• Role: Tank
• Weapon Type: Chroma Katana
• Aux Core Slots: 2
• Stat Modifier: Agility 15%

Battle Skills

Theory's combat capabilities focus on evasion, countering, and maintaining aggro through defensive maneuvers:

• Aerial Flashdance: Counters incoming enemy attacks with physical damage.
• Conviction: Increases damage dealt to enemies that are currently targeting the user.
• Steadfast: Boosts the user's Break resistance, keeping them on their feet during tough fights.

Field Skills

Theory provides valuable utility outside of combat with the following Field Skills:

• Ice Mastery: Up to Level 3
• Focus: Up to Level 3
• Nopon Wisdom: Up to Level 3

Blade Arts and Specials

During combat, Theory utilizes specific Blade Arts and Specials to control the battlefield:

• Blade Arts: Accuracy Up, Nullify Reaction
• Specials:
  • Ice Slash (Lv. 1)
  • Frost Banish (Lv. 2)
  • Rebel Sister (Lv. 3)
  • Winter's Wake (Lv. 4)

Theory's Favorite Pouch Items

To quickly unlock nodes on Theory's affinity chart, you should feed her favorite pouch items. Her preferred general categories are Veggies and Board Games.

If you want to maximize her affinity gains, use her specific favorite items:

• Steamed Veg Stralu (Veggies category)
• Sparkly Snow Perfume (Cosmetics category)