Blackening (黒化, Kokka?, localized as "Darkening") is a process by which a being is tainted by an outside force, causing their personality to be reversed toward the orientation of evil.[1] For Servants, this is one of several processes that can lead to a Servant becoming an Alter. There are several different processes that can blacken a being.

Holy Grail Mud (All the World's Evils)[]

Heroic Spirits that come into contact with the mud from the Fuyuki Holy Grail, tainted by All the World's Evils, gain bodies of cursed flesh, and they are tainted by it as well. The contaminated servant's personality reverses toward the orientation of evil. The blackened Servant is incarnated by the power of the Grail so the more concrete ties to the physical plane turns them into powerful beings. Their physical interference power increases, but at the same time, they lose the ability to return to spirit form. They no longer bother to restrain their magic energy consumption, so their fighting ability jumps significantly. They do not have precise control, but their destructive power is increased. Their momentum can be likened to a runaway car that never runs out of fuel, so fine handling is impossible because it is out of control.[2][3]

They are fearful beings inflicting havoc and death upon the world. These are blackened Servants like Saber, completely corrupted and changed into Saber Alter, while someone with an extremely strong ego like Gilgamesh was able to resist the majority of the effects.[4] During the Heaven's Feel scenario, Archer states that distorted Heroic Spirits like himself and the True Assassin have some resistance against the tainted ichor and corrupting influence of the Holy Grail.

During the True and False Holy Grail Wars, Bazdilot Cordelion would use Grail Mud to twist True Archer from his heroic persona into a hateful half-Avenger.

Holy Grail Mud (Fate/Prototype)[]

In Fate/Prototype, the Servants who were defeated in the first Holy Grail War were later revived as blackened versions of themselves via the power of Beast of 666 and the Greater Grail. In addition to being blackened, not only were their powers enhanced, their appearance became distorted (e.g. vials attached to Brynhildr's neck) and their personality underwent drastic changes. In the case of Jekyll, Hyde became the dominant personality and his appearance changed to that of his Assassin counterpart. All of the Servants also became more fierce and violently aggressive.

Chaos Tide[]

The Sea of Life is a Personal Skill of Tiamat that expresses her Divine Authority as the "the Sea From Which Life Itself is Sprung". Being that the Sea cycles the True Ether of the Genesis of Earth, the supply of Magical Energy available to Tiamat's Magical Energy Reactor is within the boundaries of the domain unlimited. The movement by which the Sea of Life extends its domain is referred to as the Chaos Tide.[5]

The substance of the sea is Black Mud that pollutes Saint Graphs, remaking any organisms that enters unto the sea into a "Child of Tiamat". Upon emergence from the mud, the Children of Tiamat are imposed with a cellular-level Geis that makes into enemies of Man.[5] Servants are no exception to this process.[6]

During the events in the Babylonia Singularity, Kingu mentioned that the Black Mud from the Sea of Life is the substance referred to as the Mud of the Grail amongst practitioners of Magecraft.[6]

Pandora's Box[]

Being utilized by Darius Ainsworth, while some who are affected turn into Alters, such as Saber Alter, others are different. Some changes are quite mild, with Medusa and Medea suffering mere cosmetic changes, while Heracles' elbow spikes become much more exaggerated. In the most extreme cases, a massive physical change can occur, such as Cu Chulainn transforming into a werewolf-like shape, or Gilgamesh assuming the form of a deformed and blackened giant.[7] The defining trait of those under the effect of Pandora's Box however is an all-consuming thirst for the Holy Grail as a means to fulfill their wish, making them perfect shock troops for Darius and his allies.[8]


  1. [v] Fate/complete material III: World Material - The Servants of the Fifth Holy Grail War:
    Blackening of Servants, p.038 [T]

    Blackening of Servants
    The black mud in the Holy Grail contaminates the souls of those who touch it. It goes without saying for mere humans, and supernatural beings like Servants are no exception to this either. The contaminated person's personality reverses toward the orientation of evil. This is madness caused by touching Angra Mainyu. This is called "blackening". There are those who can use the black mud as part of their own power thanks to the properties of its contamination and those whose powerful egos have stayed back its mental pollution.
    An example of the former is Matou Sakura and the latter is Gilgamesh. The blackened Servant is incarnated by the power of the Grail so the more concrete ties to the physical plane turns them into powerful beings.
    Their physical interference power increases but at the same time they lose the ability to return to spirit form.
    Also, as they no longer bother to restrain their magic energy consumption, their fighting ability jumps significantly. This momentum can be compared to a runaway train.
    Because they are in that state, fine control is not possible, but in exchange, their destructive power increases.
    They are fearful beings inflicting havoc and death upon the world. These are blackened Servants.


    Saber Alternative
    Class: Saber
    Master: Matou Sakura
    Alignment: Lawful Evil

    STR: A
    CON: A
    AGI: D
    MGI: A++
    LCK: C
    Noble Phantasm: A++

    Saber Alternative, or Black Saber, is the name given to Artoria when she fell to Hassan, was consumed by the dark shadow, and obtained true incarnation during the "Heaven's Feel" route.
    Artoria, now jet-black, could now invoke Excalibur without limit thanks to the enormous prana supply from the blackened Sakura. Thus, she could overwhelm Berserker Heracles even in a direct battle. Now unfettered and in a sense more powerful than she was in life, none can deny that she is the strongest Servant.

    Class Abilities

    Magic Resistance: B
    Lower than original value due to the corruption. Still high, as it nullifies spells at B rank (activated within three counts) or lower, and it is difficult to harm her even with high thaumaturgy.

    Riding: -
    In the maddened state while blackened, the loss of fine control makes it impossible to ride beasts; rather, the mount cannot withstand it. Therefore, in reality one can consider the Riding ability lost.

    Personal Skills

    Instinct: B
    Constant self-control is required to maintain Saber's reason while blackened. To focus on suppressing her madness, her surroundings are neglected and Instinct is dulled.

    Power Burst: A
    Saber's body is always suffused in the energy supplied by the Greater Grail. Her armor is also reinforced, granting more defensive ability than in her original state.

    Charisma: E
    The magnificent king's charm which once inspired and captivated her soldiers is gone. Since she rules by terror, leadership ability is improved but troops' morale is extremely low.

    Noble Phantasms
    Sword of Promised Victory -- Excalibur
    Rank: A++
    Type: Anti-fortress Noble Phantasm
    Range: 1-99
    Maximum targets: 1000 persons
    Even while blackened, Artoria's greatest power Excalibur is still potent. However, the sword is tainted an ominous black. Just as the fairies of the lake (Vivienne and Morgan) manifest as both good and evil, the holy sword has its own dark side. Still, its "character" as a holy sword is greatest. The function of converting the wielder's magical energy into light through the blade does not change, but the light is transformed into the same darkness of the blade.

  2. [v] Fate/complete material III: World material - FAQ with Nasu: Servants, p.132

    Q: As a percentage, how much are the abilities of blackened Servants enhanced? Or, when such Servants have an excess mana supply like Saber (Artoria) did, can they reach a level of power comparable to or greater than what they had in life?

    Q: As a percentage, how much are the abilities of blackened Servants enhanced? Or, when such Servants have an excess mana supply like Saber (Artoria) did, can they reach a level of power comparable to or greater than what they had in life?

    A: They’re like runaway cars that never run out of fuel. Except, since they’re out of control, fine handling is impossible!



  3. [v] Fate/side material - Encyclopedia: Blackening [Others], p.060 [T]

    Blackening [Others]
    The transformation caused by the pollution of an unidentified curse.
    In the blackening of Servants, the Alignment and personality of a Servant would change as well.
    Blackening would definitively incarnate Servants and cause them to become more powerful.
    These Servants were like Frankensteinian monsters created by evil organizations. Most of them underwent significant changes in design and appeared as almost new characters.


  4. [v] Fate/complete material III: World material - FAQ with Nasu: General Questions about Fate, p.130-131
    Q: In Sakura’s Route, what happened to the devoured Gilgamesh?
    Q: In Sakura’s Route, what happened to the devoured Gilgamesh? Saber was blackened and enslaved, but was Gilgamesh’s will too strong to be dominated? Or was he completely digested?

    A: He simply cannot be controlled. In fact Gilgamesh cannot be blackened. After being devoured by the Grail, Sakura converted Gilgamesh into mana in haste because she was afraid that Gilgamesh might tear her up from the inside if she does not digest him. However, His Majesty was very hard to digest, so “Angra Mainyu” must have been plagued by belly-ache (laughs).

  5. 5.0 5.1
    [v] Fate/Grand Order - Tiamat (Beast II) Profile [T]

    Tiamat - Beast II

    Illustrator and Voice actor
    Illustrator: Kotetsu Yamanaka
    Voice Actor: Aoi Yūki

    Strength: A+
    Endurance: EX
    Agility: C
    Mana: A++
    Luck: EX
    Noble Phantasm: -

    One of the creator deities of Mesopotamian myth.
    The gods were born from the union of the freshwater Abzu and the saltwater Tiamat. Then, the gods rebelled against their father, and seized authority over the world from him.
    Tiamat quietly approved of her children’s actions. It was proof that her love for her children outweighed her love for her husband.

    However, the gods then turned their blades on Tiamat. Tiamat wailed and raged, birthing eleven new Magical Beasts to oppose the gods.
    At the end of the war, Tiamat and the Eleven Beasts were destroyed.
    The gods split Tiamat’s corpse in two, and used them to form the heavens and earth. It is said that this ritual created the world of humans.

    Unlock: Primal Planet, Admiring the Sky
    Height/Weight: 160 cm ~ 74000000 km²(3)・??kg
    Source: Ancient Mesopotamian Mythology
    Region: Mesopotamia
    Alignment: Chaotic Evil  Gender: Female
    The black mud is also included in Tiamat’s height. However, the mud is made of imaginary numbers, so her weight is unquantifiable.
    Meanwhile, Tiamat’s volume is infinite. In other words, she is a four-dimensional pocket.

    Unlock: Primal Planet, Admiring the Sky
    Tiamat is the womb that was cast aside after the world was created.
    She is the Maternal Sea who was used as the soil to give birth to life, but once the Earth’s environment settled and ecosystems were established, Tiamat was deemed unnecessary and driven out into the world of imaginary numbers. (The Inner World. Lifeless imaginary number space, not a parallel universe.)

    Because the Earth’s ecosystems were established, Tiamat, who randomly designs life, was no longer needed.
    The goddess became nothing more than an obstacle to the process by which life forms acquired the intelligence determined by the planet.
    Since then, Tiamat has been waiting in the world of imaginary numbers for her chance to return to Earth.

    Unlock: Primal Planet, Admiring the Sky
    [Class Skills]

    • Authority of the Beast: A

    This can be considered an anti-humanity Skill.
    It is an ability that is especially effective against Heroic Spirits, Divine Spirits, and all things born from the mother’s body.
    This Skill is not possessed solely by the Second Beast, but also by all Magical Beasts she gives birth to.

    • Independent Manifestation: B

    The Skill to manifest independently in the current world.
    Seven days after manifestation, the Indian Ocean will be smothered black.
    Once Tiamat manifests, she unceasingly gives birth to Magical Beasts, and sets out to devour humanity.
    However, the body of the Second Beast is the ocean itself, so it cannot move onto land. Instead, it is her children’s role to mop up the human race.
    Furthermore, this Skill is an expression of the holder’s presence across all of space-time, rendering her immune to attacks by methods such as time travel paradoxes, and canceling out all instant death attacks as well.

    • Self-Modification: EX

    Tiamat can remold her own Saint Graph using the black Sea of Life.
    Her body can grow from its standard Saint Graph (Femme Fatale) into that of a dragon over 60 meters in length.
    Once Tiamat becomes a dragon, attacks against her of A++ rank or lower are nullified.

    Unlock: Primal Planet, Admiring the Sky

    • Sea of Life: EX

    The Second Beast itself is the sea which gives rise to life.
    It cycles the True Ether of primordial Earth, so its mana supply within this sea is infinite.
    All who are caught and drowned in the black mud are randomly assigned the following Skills: Self-Modification, Life Transformation, Life Fusion, and Individual Multiplication.
    Once these organisms exit the sea to make landfall, they are forced into a cellular-level geis — a nitrogenous base contract (amino-geis) — and automatically become enemies of humankind.

    • Nega-Genesis: A

    A Skill of the same type as Nega-Messiah, which is possessed by the Sixth Beast.
    It is a conceptual bounded field which completely overturns modern evolutionary theory and the predictions of Earth’s genesis.
    Thanks to this ability, the Second Beast has acquired a strong resistance to the Noble Phantasms of Servants created by correct human history.

    • Monstrous Strength: A++

    One’s ability as a monster. This Skill raises the user’s Strength.
    It is at about the highest possible level. This is why Tiamat’s Strength is that of a titan when she makes the black mud into her body and manifests in her draconic form.

    Unlock: Primal Planet, Admiring the Sky
    With the collapse of the cornerstone of anthropic principle, Tiamat managed to return to this world with the power of the Holy Grail. And yet, she was in middle of a slumber.
    Setting aside wherever it was caused by Merlin’s magecraft, she awoke from that sleep due to the attack from Chaldea and set out to eradicate mankind in accordance with her instincts.

    While there is resentment・hatred・sadness for being discarded as someone who had already served her purpose, this is also a deed of indulging in the “joy” of once again repainting the Earth’s ecosystem and having everything come back to the mother.

    Her Class was determined by this true nature described above.
    The goddess of genesis and the likes are nothing but fake names.
    Deserted by humans, this is one of the most rejected great disasters in human history.

    Its name is Beast II.
    One of the seven human vices, the beast carrying the principle of "regression."

    Unlock: Primal Planet, Admiring the Sky
    It is impossible to confirm if Tiamat possesses anything resembling a personality.
    Perhaps she lost her intellect, or perhaps she never had one to begin with. Either is acceptable.
    The only meaning to her existence is to create, raise, and love her children. Thus, she set out to make war against humanity for declaring that it has no need for her.
    It is the functioning of an extremely primitive system: “If I do not exterminate modern humanity, I will be killed.”

    •Motivations・Attitude towards the Master
    One of seven billion. An obvious target to be obliterated.
    While the Second Beast is a repulsive invader to humanity, humans are terrifying aliens (extraterrestrials) to the Second Beast.

    ティアマト - ビーストⅡ





    属性:混沌・悪  性別:女性

















  6. 6.0 6.1 Fate/Grand Order - Babylonia: The Absolute Frontline in the War Against the Demonic Beasts
  7. Fate/kaleid liner PRISMA☆ILLYA 2wei! - Chapter 26: "Black Fate"
  8. Fate/kaleid liner PRISMA☆ILLYA 3rei!! - Chapter 22.2: "One Hand Takes, Another Hand Saves"