Azoth Sword (アゾット剣, Azotto Ken?) is a Mystic Code used as a tool for performing magecraft, amplifying the user's magical energy to assist with spells and strengthen them. Filling it with magical energy allows for it to be utilized as a magic wand at any time to form magic circles and affect physical divine mysteries. While it is called a dagger, it is not meant to be a weapon used for slashing or stabbing in its ceremonial nature, but it can function as such to kill a person. It is one of the most commonly used Mystic Codes in the Mage's Association, and parents or teachers often present it as a gift to students at coming of age ceremonies. Using it to slay something like a Servant can cause it to crumble away instantly afterward.
The Azoth Sword given to Kirei Kotomine by Tokiomi Tohsaka was meticulously crafted from Tohsaka heirloom jewels, given to him for having practiced the family's magecraft. It is shorter than normal to fit his preference, and it has "AZOTH" carved into the jewel. Rin Tohsaka is later given the dagger, and though it is well-used, she uses it sparsely compared to her jewels because it is weaker than them. Its overall capacity is great, allowing her to fill it with ten of her strongest jewels to give it over one hundred times her normal capacity when attempting to use it as the base for the Jeweled Sword of Zelretch. She only occasionally instills it with magical energy under normal circumstances, and filling it with magical energy and using the word "läßt" will activate it for anyone. In the Fate scenario Shirou Emiya utilizes it by stabbing it into Kirei's chest, and then punching it after gathering his magical energy into his hand while calling the word of release. In the Heaven's Feel scenario, Shirou uses it to deal the last blow against Saber Alter.
It appears in various anecdotes about Paracelsus, the man who created the basis of modern alchemy in the early Renaissance period. It is said he carried the original with him at all times, described as a sword with a jewel set in the pommel with the word "Azoth" inscribed on it, though some sources identify it as a cane rather than a sword. It supposedly had a secret compartment in the hilt in which he stored a philosopher’s stone that allowed him to transmute lead into gold and cure any illness.
 Fate/complete material II: Character material - Weapons: Azoth Sword, p.122
User: Tohsaka Rin
Though it is nominally a dagger, it is not a weapon for slashing or stabbing. Rather, it is a tool for performing magecraft. As an amplifier for the user’s magical energy, it can be used to assist with and strengthen spells.
It is one of the most commonly used mystic codes in the Association, and is often presented as a gift by parents or teachers at coming of age ceremonies.
The sword appears in various anecdotes about Paracelsus, who created the basis of modern alchemy in the early Renaissance period. It is said he carried with him at all times a sword with a jewel set in the pommel, and that the word “Azoth” was inscribed on the jewel. The sword supposedly had a secret compartment in the hilt in which he stored a philosopher’s stone, allowing him to transmute lead into gold and cure any illness.
(Some sources identify it as a cane rather than a sword.)
この剣の元となっているのは、ルネサンス期の初めに近代錬金術の基礎を築いた人物パラケルススにまつわる逸 話に登場するアゾット剣。彼が常に持ち歩いていた剣の柄頭には丸い玉がはめ込まれており、その玉には"Az oth"となる謎の言葉が記されていたとされる。またこの剣の鍔元にある象牙の容器には賢者の石が入れられ ており、石炭を金に変えた、病を一瞬で治したといった様々な伝説が残されている。一説には剣ではなく杖だっ たとも言われている。
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