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KOS-MOS Ver. 3 in Xenosaga Episode III

Mary Magdalene
Princess of First Division
Assistant #3 (by Professor)
2 (I, II)
3 (III)
T.C. 4765
Carioca (Archetype)
92kg (Ver.1 and Ver.2)
83 kg (Ver.3)
79kg (Ver.4)
Hair color
Light blue
Eye color
Blue (as Mary)
Vector Anti-Gnosis Weapon
Voice actor (Japanese)
Mariko Suzuki
Voice actor (English)
Bridget Hoffman (I, III)
Colleen O'Shaughnessey (II)
Luci Christian (anime)
Shion... Will feeling pain... make me complete? Relinquish your pain unto me!
—Blue-eyed KOS-MOS to Shion Uzuki

KOS-MOS, also known as Mary Magdalene, is an armored android robot combat weapon with an artificial intelligence to fight the Gnosis, developed by the interstellar conglomerate Vector Industries First R&D Division and completed in the year 4767 T.C., created by Kevin Winnicot and administrated by Shion Uzuki.

On the surface, KOS-MOS is technology which is humanity's savior meant to symbolize love, hope and healing. However, KOS-MOS actually has a second, darker purpose. Kevin built KOS-MOS as a prototype for T-elos for the purpose of "Eternal Recurrence", and monitor Shion. T-elos was intended to be the vessel and resurrection of Mary Magdalene, the partner of Jesus Christ. In other words, Kevin told Shion that KOS-MOS would be humanity's savior, but Kevin meant humanity would be saved through their extinction and death.

Design, abilities and functions Edit


KOS-MOS Ver. 4 (Episode III).

Hardware Edit

She is composed of entirely mechanical parts, possibly from a superior breed of complex nanomachines, a rarity in the age of advanced Realian technology which have replaced androids. Androids are already outdated and are mostly in old space novels. KOS-MOS has an advanced CPU.

In addition, the source of KOS-MOS' power comes from U-DO by using the original Zohar as a door. Unfortunately, this means that every time KOS-MOS uses her abilities, Shion reacts to U-DO and loses her life force.

Software (personality) Edit

She is equipped with a "Simulated Personality OS", or artificial intelligence (AI), to aid in communication, and though her speech conveys her role as a robot in service to humans, her tendency to put logic and probability first makes her quite difficult to manage at times. The basic tenet to which she adheres is based on logic, probability, and completion of her mission above all else in all situations. She also unconditionally protects Shion. The algorithms she is programmed with do not support the comprehension of illogical human thought.

KOS-MOS also possesses a wireless U.M.N. connection and can instantly answer any question asked - for example, if KOS-MOS is asked what the capital of the Galaxy Federation is, KOS-MOS will reply "Lost Jerusalem". At one point, Shion is confused by Albedo being attached to Rubedo, and KOS-MOS explains how twins can share organs.[1]



Shion tests KOS-MOS's emotional module to see if she is able to feel sadness.

KOS-MOS' elemental data structure duplicates that of a human brain. She appears to be emotionless, but throughout the series, evidence indicates that this is not entirely true. A predetermined set of emotions has been hard-coded into her emotion module to better facilitate interactions with humans. She will emit an expression such as sadness only when that response is deemed necessary. However, if the emotion module of her program has determined that it is not currently necessary, she will not emit an expression.

Specifics Edit


KOS-MOS, Mary Magdalene and T-elos.

  • The name 'KOS-MOS' is a recursive acronym used to denote an Anti-Gnosis tactic system. It stands for "Kosmos Obey Strategical Multiple Operation System". Another translation is a "strategical multiple-operation control system that obeys the rules of order".
  • Her development codename is "KP-X", and she is self classified as a "Special Humanoid Anti-Gnosis Annihilation Weapon".
  • Her serial number is "000000001".
  • Her login password is "Ye shall be as gods", which is Genesis 3:5 from the Bible.
  • Her system is NATARAJA, an avatar of Shiva, represented as a dancing figure with many arms. It is of particular interest that this system is named after Shiva, who is also the god of creation and destruction. The system itself was designed by Kevin.

Combat and abilities Edit

Xenosaga I01:34

Xenosaga I. KOS-MOS (7 Abilities)

KOS-MOS killing Gnosis in combat.


KOS-MOS using D-TENERITAS, an ability that fires energy balls from her breasts.

KOS-MOS has significant powers believed to be superior to all other party members, with the possible exception of Jr.'s Red Dragon Mode. In addition to superhuman strength and speed, her body is formed from some sort of highly advanced nanomachines that allows her to morph parts of her body (specifically her arms) into various energy projectile and melee weapons. This body is also able to self-repair and is very durable though not indestructible, and she is also protected by a force-shield.

She also possesses the ability to summon weapons such as the F-G-SHOT gatling guns and her famous F-SCYTHE and equipment without the use of the U.M.N.

She has a long-range sensory array, the D.S.S.S. (Double Slot Sensory System, read as "D-triple-S") and CPU that either rivals or exceeds even those possessed by Observational Realians. The D.S.S.S. detects Gnosis in the imaginary realm.

She possesses the Hilbert Effect, which is used to draw the Gnosis into our plane of reality, allowing us to come into contact with them, instead of them being able to interact with our plane's matter at will. Using Hilbert waves is proven to be one of the few ways to even attempt to attack a Gnosis. Once the Hilbert Effect has dissipated, any Gnosis previously affected will return to their state of invulnerability. KOS-MOS' power is easily thousands of times greater than that achieved by even the largest spaceships.


KOS-MOS uses X-BUSTER against Gnosis.

KOS-MOS possesses several black box components left behind by Kevin since the current KOS-MOS is essentially the archetype resurrected. There are still many 'black boxes" to be revealed but two include her potent "X-BUSTER" a weapon that fires powerful energy beams from her abdomen as well as absorb Gnosis, and components that her give her some kind of self-awareness. KOS-MOS also has some form of energy manipulation tied to the Zohar.

KOS-MOS has one last weapon system called the Tertiary Weapon System, which is seen periodically throughout the series. They consist of a set of energy wings, a pair of energy cannons and other attachments meant to be fitted onto her. The wings and cannons are part of a Phase Transfer Cannon. While wearing this gear she is shown in a premonition flying through space at sub-light speed and then confronting U-DO above an unknown planet. The exchange that follows destroys several planets. The "Third Armament" as it's also known makes a real-time appearance in Episode II on the Omega System. KOS-MOS uses this equipment to protect Shion and the party from a U.M.N. Phase Transfer Cannon fired by Proto Omega.


Shion calibrating a malfunctioning KOS-MOS.

There is evidence to suggest that a failsafe that dampens KOS-MOS' output is present when she battles alongside Shion, as her reflexes and combat capability are severely lowered compared to that of cutscenes (a notable example of this is the usage of her X-BUSTER in Episode I, where it has a significantly decreased effect in battle when compared to its usage outside the Cathedral Ship). This may be due to KOS-MOS' programming preventing her from doing anything to place Shion in danger, and that unleashing her full potential with Shion nearby is likely to get her caught in the crossfire.

Finally, KOS-MOS also has the ability to dance.[2]

Blue-Eyed KOS-MOSEdit


Blue-Eyed KOS-MOS in Episode III.

A human-like alternate persona (Mary Magdalene) appears occasionally in the form of a blue-eyed KOS-MOS. Blue-eyed KOS-MOS appears to be more powerful than red-eyed KOS-MOS and talks in a more human-sounding voice. This form of KOS-MOS only seems to appear at times when Shion is in extreme danger and plays the role of Shion's guardian. Shion has not directly seen KOS-MOS in her blue-eyed form and is oblivious to this second persona's existence until Episode III.

Blue-eyed KOS-MOS has made four appearances in Xenosaga:

Blue eye

KOS-MOS changes eye color in Episode I.

  • Wiping out a fleet of Gnosis surrounding the Cathedral Ship with her X-BUSTER attack. Blue-eyed KOS-MOS also asked Shion during her first appearance in Episode I, "Will feeling pain make me complete?", though Shion couldn't give her an answer because she could not hear KOS-MOS' voice in the vacuum of space.[3]
  • Saving the Elsa from burning up in the Second Miltian atmosphere in Episode I.
  • Saving Shion and Allen Ridgeley in space from being killed by Voyager, the Black Testament, Episode II.
  • Saving Allen and Shion in the finale of Episode III.


Lost Jerusalem and Jesus Christ Edit

Mary jerusalem

Mary Magdalene on Lost Jerusalem.

Six thousand years ago, Mary and Yeshua were disciples of Jesus. Mary, Yeshua, Jesus and their followers were persecuted by Wilhelm, who as Guardian of the Lower Domain saw them and their power as a threat to life in the Lower Domain. Since Anima is the failsafe power which must destroy the Lower Domain in order to protect the whole universe, and considering that the followers of Jesus and Mary all had the ability to react with Anima (similar to the abilities the Testaments and most party members), Wilhelm feared the failsafe's activation. As a result, he persecuted Jesus and his disciples.

Mary is also responsible for the construction of Zarathustra; she wanted to use it in order to save the universe from destruction (similarly, Dmitri Yuriev will later attempt to act with for his partially selfish intentions), but she failed. Zarathustra ended up falling into Wilhelm's hands while the situation for the universe degraded.


Mary cries in sorrow.

Despite very little is known about her life, she was extremely close to the previous incarnation of Shion Uzuki, who was called the Maiden of Mary, and of chaos, at this time known as Yeshua. Shion is required to release the power of Animus, meaning both Mary and Shion need to exist for this power can be used to its full extent. Nevertheless, Shion (as the Maiden) died in front of Mary, who at that moment had lost all of her power by dividing Yeshua's Anima, rendering her helpless. This is apparently the biggest regret in Mary's life.

In order to prevent the destruction of the Lower Domain by the power of Anima, Mary divided the power of Anima into twelve vessels. Doing this cost her her life, but not before she saw Shion's death. Mary's death caused her consciousness to be scattered across the U.M.N.

Mary flower

Mary Magdalene's body in her coffin.

People who cared for Mary chose Rennes-le-Château to hide this vessel from their enemy, most likely Wilhelm. They also chose this place as a location to store Mary's body in a coffin full of flowers. Six thousand years later her body would still be intact.

Even though Wilhelm succeeded in stealing the Vessel of Anima later, he, for mysterious reasons, failed to take Mary's body and had to wait for Rennes-le-Château to appear in space to retrieve it.

KOS-MOS ProjectEdit

Wilhelm, in order to initiate the Eternal Recurrence, required the power of Animus. In order to do this, he needed two elements: the body of Mary resting at Rennes-le-Château and the Maiden of Mary's reincarnation, Shion Uzuki, who is needed for Mary to fully use her powers and to revive Mary's consciousness, as well as a body to complete Mary's revival.

Due to the body being impossible to reach, an artificial vessel is created for her consciousness: KOS-MOS. Her consciousness must progressively awake inside of her through her bond with Shion Uzuki, one of the co-creators of KOS-MOS. To intensify the bond between Shion and KOS-MOS, KOS-MOS' original creator, Kevin Winnicot, arranged to die at the hands of KOS-MOS' archetype. This left Shion the task of creating KOS-MOS' final form, as well as making KOS-MOS her only link to Kevin.

KOS-MOS Archetype Edit

Memories of Days Past01:48

Memories of Days Past

Kevin decides on a female form.

Kevin wanted KOS-MOS to have a female form as opposed to a male form because he wanted KOS-MOS to symbolize hope and healing, as well as a creator and protector. A female form would also be more suitable for Mary Magdalene. Kevin believes men are more prone to tyranny, destruction, conquest, slaughter, killing, war and violence, which is exactly what Kevin doesn't want for KOS-MOS.

Xenosaga Episode I HD Cutscene 056 - The KOS-MOS Incident - ENGLISH03:19

Xenosaga Episode I HD Cutscene 056 - The KOS-MOS Incident - ENGLISH

KOS-MOS goes on a murder spree, killing Vector and U-TIC employees.


Kevin sacrifices his life to protect Shion.

Kevin was killed approximately two years before the events of Xenosaga Episode I, T.C. 4765, in an accident that involved KOS-MOS booting up independently and murdering several members of the team assigned to build her by Vector's Second Division on planet Carioca. Kevin was stabbed through the chest by a berserk haywire out-of-control KOS-MOS and Shion put an end to the Archetype using a gun. Shion and Allen Ridgeley survived the attack and decided to continue the project without Kevin.

KOS-MOS's new frame was put together by Shion and the others after transplanting the core module of the partially-destroyed Archetype into a spare frame. Partially in order to shake off memories of the incident when the Archetype went out of control, the exterior of KOS-MOS's design was much closer to that of a human body. Several monitoring sensors were installed inside of the body to record real-world data.

Xenosaga Episode I: Der Wille zur MachtEdit


KOS-MOS Ver. 1
(Alt Costume Ver from Episode III).

Lieutenant Virgil's Death05:01

Lieutenant Virgil's Death

KOS-MOS kills Luis Virgil.

Shion proceeds with a test experiment on KOS-MOS. After having completed KOS-MOS, Shion and her team are attacked by the Gnosis on the Woglinde, KOS-MOS is activated suddenly and the Gnosis escape with the Zohar Emulator. Galaxy Federation Lieutenant Luis Virgil is shot and killed by KOS-MOS during these events; this, according to her, was necessary due to the fact that it would increase her ability to protect Shion.

After the Woglinde is destroyed, Shion, Andrew Cherenkov, Allen Ridgeley, and KOS-MOS are rescued by the Elsa starship, which was investigating the ruins of the starship from the Kukai Foundation. On the Elsa, the group encounters a mysterious boy, chaos, before asking Captain Matthews to escort them to Second Miltia. KOS-MOS is tuned in her service module in the Elsa's hangar.

Later, the Galaxy Federation places charges on the Kukai Foundation for the destruction of the Woglinde, due to some manipulation and framing by U-TIC Organization officials and insiders doctoring video footage. In order to prove innocence, Shion Uzuki leads a dive into the Encephalon to find KOS-MOS' black box, which will prove that the Gnosis were actually responsible for the Woglinde's destruction, since KOS-MOS stores unalterable automatic video recordings in her memory bank data.


KOS-MOS crucified in the Encephalon.

In the Encephalon, the party relives Shion's and Jr.'s difficult childhood memories, including the Miltian Conflict. Shion is encountered by Febronia, who explains that a time will come where KOS-MOS will encounter the wave existence U-DO, and in the near future, Shion will free her "sisters", Cecily and Cathe. Febronia also states that all factions involved must travel to Old Miltia. Shion then finds KOS-MOS crucified in a cave (Rennes-le-Château), in front of a tomb containing Mary Magdalene's body.

Xenosaga Episode I Escape05:41

Xenosaga Episode I Escape

KOS-MOS stays to disassemble the Proto Merkabah.

When MOMO Mizrahi is kidnapped by Albedo Piazzolla during the Kukai Foundation evacuation, she is taken to the Proto Merkabah. On the Proto Merkabah, the party encounters Albedo, who summons a Gnosis called Sophie Peithos to "test" the party and give him time to escape. Albedo sets Merkabah on a collision course with Second Miltia, which the party stops by breaking the space station into thousands of pieces. However, during re-entry, the Elsa's heat shield begins to disintegrate; KOS-MOS briefly morphs into a powerful being to prevent the Elsa from being destroyed.

Xenosaga Episode II: Jenseits von Gut und BöseEdit



In Episode II, KOS-MOS has little effect on the plot and is simply a supporting character.

At Second Miltia's Vector Industries headquarters, Shion, Allen Ridgeley, and KOS-MOS are briefed of the increasing Gnosis threat.

KOS-MOS receives a new frame created by the Second R&D Division on Second Miltia during the KOS-MOS OS tests. In order to shield her internal organs from shocks delivered to the outer body during combat, her body was filled with fluorescent blue anti-G gel. The Hilbert emission device, which had taken the form of a visor in Version 1, was miniaturized and installed into her forehead. Her body was designed with the implementation of the Tertiary Weapons System in mind; its resilience was increased dramatically.

Her data is sent to the Encephalon dive while at the R&D Division.

Xenosaga Episode II HD Cutscene 68 - Feb's Sisters Awakening of Omega - ENGLISH09:58

Xenosaga Episode II HD Cutscene 68 - Feb's Sisters Awakening of Omega - ENGLISH

KOS-MOS sets Cecily and Cathe free.

In Labyrinthos on Old Miltia, KOS-MOS destroys Cecily and Cathe for Shion and Febronia, freeing them from their suffering.

When Albedo links with the Zohar/U-DO in the Ω System, KOS-MOS transforms and shields Shion and the party to protect them from the waves of the space-time anomaly.

After the events of the game, KOS-MOS and Shion return to Second Miltia.

Xenosaga: A Missing YearEdit


KOS-MOS rescues Shion in Ars Nova.

In T.C. 4768, Gnosis raid the S.O.C.E. lab due to an increase in Gnosis Terrorism. Shion and KOS-MOS rush to the lab to rescue the survivors. However, in the process, Scientia agent Doctus kidnaps Almadel and half damages KOS-MOS. After the incident, KOS-MOS is sent for repairs and is upgraded from version 2 to version 3.

Later, KOS-MOS rescues Shion from a Gnosified Almadel in Ars Nova, one area of S-Division within the U.M.N. sealed by Vector Industries. KOS-MOS is equipped with a new exoskeleton. Unfortunately, despite KOS-MOS and Jin Uzuki's efforts, Almadel still dies.

After an emotional breakdown from Shion, KOS-MOS helps her up by giving her a hand.

Xenosaga Episode III: Also sprach ZarathustraEdit


Shion left Vector, and more Gnosis attacks are occurring, termed Gnosis Terrorism. Unfortunately, because KOS-MOS is owned by Vector, Shion could not keep KOS-MOS with her, and Allen looked after KOS-MOS for Shion.

Xenosaga Episode III - Chapter 2 - CAT Testing Ground - KOS-MOS vs02:02

Xenosaga Episode III - Chapter 2 - CAT Testing Ground - KOS-MOS vs. Omega

KOS-MOS fights Ω Res Novae and loses.

Vector Industries decides to terminate the KOS-MOS program in favor of the newer and more advanced T-Weapon Program that resulted in the development of T-elos. Seeing KOS-MOS as an expendable asset, she is used as a live-fire opponent for the new Omega Res Novae machine. In the fight KOS-MOS utilizes nearly every attack in her arsenal including her X-BUSTER but is unable to destroy the enormously larger Omega. She appears to have some effect as Omega malfunctions during the fight, and it is forced to cancellation. When T-elos is demonstrated as being superior, KOS-MOS is ditched in a garbage compacter.

KOS-MOS (CAT Testing Ground)02:46

KOS-MOS (CAT Testing Ground)

KOS-MOS is rescued by Shion.

Juli deduced that only KOS-MOS has the ability to break open the hypersphere of Rennes-le-Château for them to rescue the Elsa. The team made their way to Fifth Jerusalem and met up with Shion. Together, they broke into the Federation compound to salvage KOS-MOS, which had been dumped at the scrap yard. With KOS-MOS's help, they managed to break into Rennes-le-Château and made contact with the Elsa.

KOS-MOS vs08:26

KOS-MOS vs. T-elos (Ancient Temple Tomb)

T-elos on Rennes-le-Château.

KOS-MOS continues to travel with the group until doing battle with T-elos in Rennes-le-Château. The two engage in a pitched battle, in which KOS-MOS is completely dominated by T-elos. KOS-MOS only manages to connect with a single attack against T-elos while taking severe damage herself. Finally T-elos utilizes her Phase Transfer Cannon, which KOS-MOS attempts to deflect. Her effort fails and she sustains crippling damage from the attack. T-elos completes the fight by driving her heel through KOS-MOS chest as she lay on the ground. As KOS-MOS lay "dying" Shion has a vision of Mary Magdalene as she stares at T-elos.

Xenosaga Episode III - Chapter 4 - Dabrye Mine - KOS-MOS's Eternal Sleep01:23

Xenosaga Episode III - Chapter 4 - Dabrye Mine - KOS-MOS's Eternal Sleep

KOS-MOS is heavily damaged.

When KOS-MOS is examined by Shion, Allen and the Professor, they come to the conclusion that KOS-MOS will never again be operational due to the severe damage. This outcome changes when Shion is able to obtain the original design data from a past Kevin Winnicot (unknown to him) while masquerading as U-TIC personnel. With the assistance of the Professor's Erde Kaiser technology, KOS-MOS is rebuilt into her Version-IV form. The new KOS-MOS is considerably more powerful.



KOS-MOS awakens to protect Shion when she is attacked by the Testament Voyager. Her rebuild also grants KOS-MOS the ability to reject the commands and directives of Kevin Winnicot, something she was incapable of before.

It eventually becomes clear that KOS-MOS was the prototype for T-elos, who in turn was intended to serve as the vessel for the resurrection of Mary Magdalene. KOS-MOS came to be the repository for Mary's spirit, while T-elos was constructed from the remains of Mary's body. In order for the resurrection to be complete, one would have to destroy the other. All of this fit in with the plan master-minded by Wilhelm to use Mary Magdalene's power to operate Zarathustra and "reset" the progression of time in the universe back to an earlier stage. It was this very activity that lead to the creation of the Gnosis as eventually human spirits began to reject the repetitive existence.

KOS-MOS vs02:59

KOS-MOS vs. T-elos (Underground Ruins)

T-elos recombines with KOS-MOS.

KOS-MOS has a final showdown with T-elos as Shion and the group make their way to Zarathustra on Michtam. At first the fight proves a stalemate, as T-elos is unable to completely overwhelm the rebuilt KOS-MOS as she did before. In the second fight KOS-MOS is able to completely evade T-elos attacks, but fails to land any of her own. Finally T-elos resorts once again to her Phase Transfer Cannon. As before KOS-MOS attempts to deflect the blast, and this time is successful doing so with only one hand. T-elos then fires a second, much more powerful shot. KOS-MOS answers by revealing her own Phase Transfer Cannon and returning fire. The two weapons meet, with T-elos weapon being overcome. T-elos is then encased in the array, and KOS-MOS utilizes a knife to shatter the globe. This is sufficient to disable T-elos or perhaps even kill her as she does not move or speak afterward. Following this the two begin to resonate with one another as KOS-MOS kneels and takes T-elos in her arms. T-elos dissipates into particles which are taken in by KOS-MOS. This completes Mary's Resurrection with the merging on body and spirit.

The new entity, however, is not a complete recreation of Mary Magdalene. KOS-MOS states that she is both Mary, and not Mary, meaning she received Mary Magdalene's memory and power. After the group defeats Kevin, the Red Testament, they enter the chamber of Zarathustra. There Wilhelm attempts to command Mary to assist him in activating the device as he has apparently done several times before when he previously reset universal time. This time, however, KOS-MOS refuses and destroys the key to Zarathustra, stating that her name is not Mary, but KOS-MOS. Her eyes change from blue to red. It is left to interpretation if KOS-MOS and Mary are two separate entities or if KOS-MOS is the result of the merging of Mary's consciousness and her original OS.



Shion and KOS-MOS.

A violent battle then ensues as Zarathustra goes out of control. After great effort the group manages to overcome Zarathustra. Nephilim then appears stating that her and chaos will begin summoning the troubled spirits of the Gnosis and returning them to the "Land of Origin" also known as Earth. They state that they will be unable to defend themselves while handling this task. KOS-MOS stays behind to protect them in this task. KOS-MOS and Shion share final words where KOS-MOS states that they will see each other again, and that their time apart will be a mere instance in the scope of universal time.

KOS-MOS transfers a part of Mary to Nephilim. It is not clear within the confines of what is shown if she transfers the spirit of Mary, or merely the animus power. The group then retreats, and KOS-MOS begins fighting the swarms of Gnosis who attempt to attack chaos and Nephilim. Fearing that not even KOS-MOS can handle the large numbers of Gnosis alone, Jin returns to give her assistance. KOS-MOS is able to destroy a large number of Gnosis before losing an arm while wounding another. Jin manages to finish the particular Gnosis off and the two continue fighting. Jin is killed after being stabbed to death, leaving KOS-MOS to finish protecting the others on her own.


KOS-MOS's torso drifts to Lost Jerusalem.

She manages to hold the Gnosis off as chaos and Nephilim approach completion of their task. As they approach completion, they are attacked by a Cathedral Ship type Gnosis. In an act of self-sacrifice to ensure the completion of the task, KOS-MOS energizes her Phase Transfer Cannon and leaps into the cathedral ship creating an enormous explosion. She manages to attain the victory and gives chaos and Nephilim the time to finish.

At the very end, KOS-MOS is seen in space. Her right arm and both her legs are gone, and what remains of her body is badly damaged. As she drifts, she hears chaos' voice, telling her that apparently the universe still needs them. He then tells KOS-MOS to sleep until they are needed again. KOS-MOS closes her eyes as she drifts through space toward the sun rising over Lost Jerusalem.

Tech Attacks Edit

KOS-MOS combat03:11

KOS-MOS combat

List of Episode I Tech Attacks
Skill Level Description Speed/Wait
R-Blade Default Attack with a sword arm 200/10
R-Cannon Default Attack with a beam arm 200/10
R-Drill Attack with a drill arm 300/30
X-Buster Abdominal spread beam weapon 800/40
S-Chain Causes "Slow", "Dex Down" and "Phy Def Down" on Biological, Gnosis-Type enemies; Causes "Slow", "Dex Down" and "Armor Down" on Mech-Type enemies 300/30
R-Hammer Attack with a hammer arm 400/30
R-Dragon Attack with a dragon arm 400/30
Xenosaga Episode III - KOS-MOS (Pre Fully Awakened) All Techs and Special Attacks01:20

Xenosaga Episode III - KOS-MOS (Pre Fully Awakened) All Techs and Special Attacks


Battle quotes

  • "Target locked on. Commencing combat mode."
  • "Hilbert Effect active. Gnosis materialization complete."
  • "All battle systems are go."
  • "Disabling auto-safety. Destroy all targets!"
  • "Your orders, Shion?"
  • "All systems clear."
  • "The enemies have been exterminated."
  • "My external appearance is down 5%. Shion, I need to be cleaned."
  • "Requesting recovery of HP."
  • "I recommend reorganizing the group."
  • "Shutting down."
  • "Returning to battle."
  • "Charging."
  • "All systems functioning normally."
  • "Engaging with maximum output."
  • "Eliminating enemy threat."

Episode I

  • "A predetermined set of emotions has been hard-coded into my emotion module to better facilitate interactions with humans. In order to better facilitate a relationship with you -- Chief Engineer Shion Uzuki of the KOS-MOS Project, Vector Industries First R&D Division -- I will emit an expression such as sadness, only when that response is deemed necessary. However, the emotion module of my program has determined that this is not necessary at this time."
  • "The algorithms I have been programmed with do not support the comprehension of illogical human thought."
  • "Shion, you forget I am not human. I am merely a weapon. You of all people should be well aware of that fact."
  • "What is your decision? Will you board the escape pod? Or will you not board the escape pod? If you wish to express remorse for his death, it is best that you survive. Otherwise, you will render his death meaningless."
  • Allen: "The two of us'll starve to death in this pod! You can't do this!"
    KOS-MOS: "Actually, suffocation would come first."
  • "Dish washing requires a rather fine adjustment of one's power output."
  • "I have confirmed that this object can be identified with a 99.99998% probability to be the Zohar emulator that was stored onboard the Woglinde."
  • "All photon, lepton, hadron, and graviton scans read negative."
  • "Relinquish your pain unto me!"
  • "I am happy... to be of service."

Episode II

  • "Shion, if you interfere, I will be required to take drastic measures."

Episode III

  • "This is checkmate." (attacking Voyager)
  • "Shion, it appears that I have caused you undue emotional stress while my functions were suspended. I must apologize."
  • "Shion. Thank you. I know that I failed to protect you back then, but, this time... I will! I'm leaving the rest to you now, Shion!"
  • "The time we'll spend apart will be an instant in the flow of universal time. I know we'll meet again... so please don't be sad... Shion."

Themes Edit


Episode I

Episode II

Episode III

Xenosaga DS

Super Robot Taisen OG Saga: Endless Frontier EXCEED


Xenosaga III KOS-MOS Oneshot Final Boss01:31

Xenosaga III KOS-MOS Oneshot Final Boss

KOS-MOS using D-TENERITAS to one-hit-kill Zarathustra.


KOS-MOS Archetype.

  • D-TENERITAS, or "teneritas", is Latin for "softness" or "tenderness". This may be a humorous joke to how "soft" and "tender" KOS-MOS's breasts are.
  • In Norse mythology, a valkyrie is one of a host of female figures who choose those who may die in battle and those who may live.
  • In Episode I, KOS-MOS also has, like MOMO's Kirschwasser outfit, her Archetype. It is found in the A.G.W.S. Hangar in the Woglinde. This is only in the Reloaded version of the game, however.

The infamous MOK-KOS.


A parody of MOK-KOS. More here.

  • The limited edition of Xenosaga Episode II includes an action figure of KOS-MOS. The action figure is called "Jashin MOK-KOS" ("Jashin" stands for "evil god" in Japanese), because its shape is terribly ugly, and spawned a meme.

Cameos and references in other games Edit

  • Nearly every element of KOS-MOS' outfit, from her hair to her boots, is available as items for created characters in Soul Calibur III (Known as the "Type X" outfit).
  • In Tales of the World: Narikiri Dungeon 3, one can find an item that allows to make a KOS-MOS costume which allows her to be used in battle: interestingly, she is the only character not from a Tales game with a desperation move that requires low life to use, namely her X-BUSTER.
  • In Tales of the Abyss, the character Anise can use X-BUSTER with the help of a rare item.
  • There is a KOS-MOS costume as Downloadable Content for the character Judith in the PS3 version of Tales of Vesperia.
  • KOS-MOS (Version I), as well as Shion Uzuki and MOMO, appear in Namco × Capcom, another game by Monolith Soft.[5]
  • KOS-MOS, in her version IV form, along with T-elos also appears in the role-playing game called Super Robot Taisen OG Saga: Endless Frontier. Her capsule is discovered in the basement of a castle, which had been recovered after it was brought into the Endless Frontier. When the main character's party finds the capsule and opens it, KOS-MOS activates, noting that the final checks on her new form were not yet complete. KOS-MOS also recognizes two members of the party, Reiji Arisu and the kitsune Xiaomu, from the events of Namco x Capcom, putting the two games in continuity with each other. T-elos also appears as an enemy in the game, though their conflict (hinted but not explicitly said to be the events of Episode III) remains unresolved by the end, where they are presumed to have returned to their home dimension.
Mugen no Frontier EXCEED KOS-MOS's All Attacks02:25

Mugen no Frontier EXCEED KOS-MOS's All Attacks

KOS-MOS in Super Robot Taisen OG Saga: Endless Frontier Exceed.

  • She and T-elos also return in the sequel, Endless Frontier EXCEED, while this time also receiving support from MOMO. T-elos appears as an enemy, but at some point in the game joins the party as a support character as well. Both games also feature the two main characters from Namco x Capcom, whom KOS-MOS recognizes, placing the two series' in continuity with each other.

Fiora and KOS-MOS / Mary Magdalene.


Archetype Edit

Xenosaga Episode I: Der Wille zur Macht Edit

Xenosaga: The Animation Edit

Xenosaga Episode II: Jenseits von Gut und Böse Edit

Xenosaga: A Missing Year Edit

Xenosaga Episode III: Also sprach Zarathustra Edit

Figures Edit

Cameos Edit

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