Black Key

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  • Black Keys

Black Keys (黒鍵, Kokken?) are a sacrament of the Church, one of their many charms used against demons and vampires.[1][2] As Keys of Providence, they are able to call forth the original laws of nature vampires were subject to as humans, thus preventing them from healing the wounds made with this weapon.[3] Emphasized on the ability to intervene spiritually against "evil", they focus less on physical attack power, even affecting powerful spirits like Servants to some degree should they be struck.[1][2] It is not enough to inflict any sort of fatal injury to them no matter how much energy is put into them, but the can be used to distract or pin them for a brief moment under the right circumstances.[4] Those used by Shirou Kotomine, a "sham of a saint" and Servant, are noted to be much more powerful and "abnormal" against Lancer of Black's Legend of Dracula compared to regular Executors.[5]

They take the form of long and slender rapier-like swords with blades measuring over one meter and extremely short hilts, looking more likely to be used to thrust than slash at the opponent. Weighing one kilo, they are too thick and oddly-balanced, feeling heavier towards the tip, to use as melee weapons in general, and they seem more like dirks made into swords or arrows even to someone who does not know of their true nature.[1][6] With low effectiveness as swords despite their appearance, and their great length, their true usage is exclusively as throwing weapons likened to bullets rather than for swordplay.[7] Despite being a basic weapon of the Church, they are mostly considered to be a symbolic weapon for Executors that not many favor due to the difficulty in learning how to handle them and their weak attack power.[2][3] Being half-spiritual, they can naturally pierce even iron.[8]

Those who wield them often hold multiple Black Keys at once in a "fan formation" between the fingers of each hand, and an expert like Kirei Kotomine can wield up to four in one hand. They can be thrown singularly or all at once with great accuracy and speed, Kirei notably able to prepare and throw a single Black Key in 0.3 seconds and perform four separate throws in 0.7 seconds.[6][8] Primarily being throwing weapons, their length makes defending against short knives and daggers hard due to the lack of balance, so Kirei prefers abandon them to use his Bajiquan instead in such situations.[6] Experts and chosen Executors generally manifest the blades from magical energy, carrying around only hilts in numbers up to the hundreds hidden under their robes in some cases.[2] Ciel passes energy through pages of the Bible to manifest them, while Kirei does not seem to apply any special method.[3] The blade is a semi-solid formed by magical energy, so they are half spiritual objects able to be over-filled with energy to increase their size more than twice over. When Kirei uses a Command Spell to forcibly fill them, it surpasses their limit to allow them to block a bullet from a Contender at the cost of their subsequent destruction.[8] It is possible for non-Church members to use them as well, such as Shirou Emiya using Reinforcement to make one as "hard as diamond."[4]

Although normally considered weak in force, it is possible to utilize the Iron Plate Effect (鉄甲作用, ?) to throw them more effectively, increasing the force of impact dozens of times to allow them to bore through even reinforced concrete walls and hit an enemy with enough force to be likened to being struck by a car. Although it would seem to be some form of magical enchantment, it is actually a "secret throwing technique" of the Burial Agency, strengthening them through pure martial arts.[9] While not normally used by devout Executors, there are several other special throwing techniques that can be applied by engraving them with spells to enchant them. Someone like Ciel is able to use them without impunity due to not being a believer, having inherited the knowledge from Michael Roa Valdamjong. The Cremation Rite (火葬式典, Kasō Shikiten?) causes the target to burst into flames upon being pierced, the Internment Rite (土葬式典, Dosō Shikiten?) causes petrification upon the target being pierced, the Mummification Rite (風葬式典, Fūsō Shikiten?) desiccates the target upon being pierced, and the Excarnation Rite (鳥葬式典, Chōsō Shikiten?) causes countless crows to descend upon the target.[10] Ciel also demonstrates an unnamed ability that immobilizes the target upon the blade piercing their shadow. She mentions that the "shadow will struggle just as hard" not to separate from the target as they attempt to escape from the binding, and only she can remove the Black Key to free them.



  1. 1.0 1.1 1.2 Heaven's Feel Route - Day 15 - Duo
  2. 2.0 2.1 2.2 2.3 Fate/stay night - Weapons - Black Key
  3. 3.0 3.1 3.2
  4. 4.0 4.1 Heaven's Feel Route - Day 15 - over load
  5. Fate/Apocrypha volume 2
  6. 6.0 6.1 6.2 Fate/Zero volume 2
  7. 8.0 8.1 8.2 Fate/Zero volume 4