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] There are several different processes that can blacken a being.

Holy Grail Mud (All the World's Evils)Edit

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)Edit

Chaos TideEdit

The Sea of Life is a Personal Skill of Beast II 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 Beast II's Mana 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 BoxEdit


  1. 5.0 5.1
  2. 6.0 6.1 Fate/Grand Order - Babylonia: The Absolute Frontline in the War Against the Demonic Beasts

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