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KOS-MOS is one of the most emblematic characters from the Xenosaga series, one of Monolith Soft most prominent work before becoming one of Nintendo's subsidiaries. Due to a partnership between Nintendo and Bandai Namco, she has been appearing in some of Monolith Soft more recent work even after the buyout.

She notably appear as a playable character in Project X Zone 2 where she is paired up with Fiora from Xenoblade Chronicles and in Xenoblade Chronicles 2 where she is an unlockable Attacker Blade of the light element.

Xenoblade Chronicles 2

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

  • Recharge Boost - Boosts Arts recharge from auto-attack.
  • Arts Plus - Boosts power of next Driver Art.
  • Critical Up - Increases critical hit rate.

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)

Affinity Chart

Name Tier Effect Prerequisite Amount Flavor Text
Key Affinity Reward 1 Unlocks level 1 of the Affinity Chart. N/A N/A N/A
2 Unlocks level 2 of the Affinity Chart. Increase the trust level 100 "Expansion of main system functions is complete."
3 Unlocks level 3 of the Affinity Chart. Increase the trust level 1300 N/A
4 Unlocks level 4 of the Affinity Chart. Increase the trust level 3800 N/A
5 Unlocks level 5 of the Affinity Chart. Go to the 7th Perimeter Skyport, World Tree and complete the quest Artificial Intelligence. N/A N/A
R-Blade 1 Increases critical damage by 25% N/A N/A N/A
2 Increases critical damage by 40% Defeat a Wood Bunnit in Gormott 5 N/A
3 Increases critical damage by 55% Use R-Blade 11 N/A
4 Increases critical damage by 70% Use R-Blade 12 N/A
5 Increases critical damage by 85% Use R-Blade 13 N/A
H-Effect R 1 When landing a hit, restores 30% of damage dealt to the whole party N/A N/A N/A
2 When landing a hit, restores 35% of damage dealt to the whole party Perform a Blade Combo 5 N/A
3 When landing a hit, restores 40% of damage dealt to the whole party Use H-Effect R 8 N/A
4 When landing a hit, restores 45% of damage dealt to the whole party Use H-Effect R 9 N/A
5 When landing a hit, restores 50% of damage dealt to the whole party Finish an enemy 40 N/A
F-G-Shot 1 Adds a 60% chance of dealing a guard-annulling attack N/A N/A N/A
2 Adds a 70% chance of dealing a guard-annulling attack Use F-G-Shot 5 N/A
3 Adds a 80% chance of dealing a guard-annulling attack Perform a Driver Combo (It's enough to just be present) 7 N/A
4 Adds a 90% chance of dealing a guard-annulling attack Use F-G-Shot 7 N/A
5 Adds a 100% chance of dealing a guard-annulling attack Defeat a Gerolf Sovereign at the World Tree. 4 N/A
Phase Transition Tech 1 Annuls enemy defense and increases Special damage dealt by 60% N/A N/A N/A
2 Annuls enemy defense and increases Special damage dealt by 70% Perform a Blade Combo 5 N/A
3 Annuls enemy defense and increases Special damage dealt by 80% Perform a Blade Combo 7 N/A
4 Annuls enemy defense and increases Special damage dealt by 90% Perform a Blade Combo 10 N/A
5 Annuls enemy defense and increases Special damage dealt by 100% Perform a Blade Combo 12 N/A
Hyperclock 1 Deal 60% more and take 10% less damage at max Affinity Perform a Blade Combo 2 N/A
2 Deal 70% more and take 15% less damage at max Affinity Use KOS-MOS's favorite pouch items (Board Games category) 2 N/A
3 Deal 80% more and take 20% less damage at max Affinity At a place in the First Low Orbit Station with a view of the outside, view the Heart-to-Heart "Daybreak" N/A N/A
4 Deal 90% more and take 25% less damage at max Affinity Raise Affinity in combat 6 N/A
5 Deal 100% more and take 30% less damage at max Affinity Raise Affinity in combat 7 N/A
Encephalon 1 Reduces aggro build-up from attacks by 20% N/A N/A N/A
2 Reduces aggro build-up from attacks by 25% Perform a Driver Combo (It's enough to just be present) 5 N/A
3 Reduces aggro build-up from attacks by 30% Perform a Driver Combo (It's enough to just be present) 7 N/A
4 Reduces aggro build-up from attacks by 35% Perform a Driver Combo (It's enough to just be present) 10 N/A
5 Reduces aggro build-up from attacks by 40% Perform a Driver Combo (It's enough to just be present) 12 N/A
Light Mastery 1 The Power of a Light Blade. N/A N/A N/A
3 The Power of a Light Blade. Defeat a Spanner Bunnit in Mor Ardain 5 N/A
4 The Power of a Light Blade. Defeat a Gerolf Sovereign at the World Tree 4 N/A
Lockpicking 1 The power to open various things. Works on doors, treasure troves, etc. N/A N/A N/A
3 The power to open various things. Works on doors, treasure troves, etc. Collect stuff 7 N/A
4 The power to open various things. Works on doors, treasure troves, etc. Collect stuff 7 N/A
Mental Arithmetic 1 Perform complex calculations at speed. Skill exclusive to KOS-MOS N/A N/A N/A
3 Perform complex calculations at speed. Skill exclusive to KOS-MOS Use a Special 11 N/A
5 Perform complex calculations at speed. Skill exclusive to KOS-MOS Use a Special 15 N/A

Favorite Items

  • Item types: Staple Foods, Board Games
  • Specific items: Master's Curry, Gladiator Wrestling

Trivia

  • KOS-MOS is the Blade with the lowest drop rate you can obtain by using a Core Crystal
    • Additionally, she is the only Blade with the light element other than Mythra in the base game.
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