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KOS-MOS is a Rare Blade in Xenoblade Chronicles 2. She can grant tremendous power to her Drivers, Rex, Nia, Zeke or Mòrag, and their allies. KOS-MOS uses the light element, wields an Ether Cannon, and acts as an Attacker in battle. She is known as KOS-MOS Re: in the Japanese version.

KOS-MOS is a character based on KOS-MOS from the Xenosaga series. She is an armored android robot combat weapon with an artificial intelligence. Her design is based on the KOS-MOS's Version 1 model from Xenosaga Episode I: Der Wille zur Macht; both the original and redesign are by Kunihiko Tanaka. Her cannons' design resembles the Zohar.


Blade Specials

  • Lvl.1 - R-Blade - Puts enemies into a hornet's nest by spraying out bullets.
  • Lvl.2 - H-Effect R - Develop the Hilbert Effect and change the course of battle.
  • Lvl.3 - F-G-Shot - After charging energy, shoot out scattered laser beams.
  • Lvl.4 - X-Buster - Fire a concentrated laser beam, but only when energy reserves are full.

Blade Arts

Battle Skills

  • Phase Transition Tech - Annuls enemy defense and increases Special damage dealt.
  • Hyperclock - Deal more damage and take less damage at max affinity.
  • Encephalon - Reduces aggro build-up from attacks.

Field Skills

  • Light Mastery - Lvl. 3
  • Lockpicking - Lvl. 3
  • Mental Arithmetic - Lvl. 3 (Skill exclusive to KOS-MOS)

Favorite Items


Some point after awakening her, she will start the quest Artificial Intelligence.


  • KOS-MOS from the Xenosaga series has most of the time red eyes, and blue eyes at the times when her original persona (Mary Magdalene) is awake. But, in Xenoblade Chronicles 2 she has apparently pink eyes.


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