|Title:||All Spells Must Be Broken|
|Transliteration:||Hakai Subeki Subete no Fu|
|Maximum number of targets:||1 person|
"This is a sword of negation and betrayal, that nullifies every kind of magecraft in the world."
Rule Breaker: All Spells Must Be Broken (破戒すべき全ての符, also translated as Destroyer of All Talismans?) is a weapon that materializes the divinity of the witch of betrayal. It is a iridescent and jagged dagger that is thin, brittle, and blunt. Its effectively nonexistent capacity as a weapon is that of a regular dagger at most, and it would not be suitable for even killing a single person. She is able to use it against normal humans, slaying her original Master and cleanly cutting off Shirou's arm without issue. Shown by the complex shape of the blade, its actual purpose is that of a key used for rituals that is described by Caster as an "indulgence from the Age of Gods that is forgiven anything for one purpose." Such ceremonial knives are designed as mere decoration, and like those, Rule Breaker was created unde the school of thought that it was never to be used as a weapon. Shirou feels an ominous feeling every time he encounters it, realizing it is dangerous to Servants after inadvertently analyzing it, manifesting as a feeling of pain in the Command Spells on his hand.
Greatly differing from other Noble Phantasms, its unique ability is that it is the ultimate anti-magic Noble Phantasm capable of dispelling and destroying any kind of thaumaturgy, an effect suitable to the Noble Phantasm that is a manifestation of Caster’s nature as the “Witch of Betrayal”. It "transgresses" on all the magecraft of the targets it pierces, contracts made from magical energy and life born from magical energy. Once it comes into contact with the ensorcelled item or person, enchantments, connections bounded through contracts, and creatures created and maintained by prana will all be returned to their original components in a state "before they were made." Contracts will be wiped clean and those with life will immediately cease to exist. There is a limit to what it is able to dispel, meaning artifacts on the rank of Noble Phantasm will never be returned to their original state no matter how low their rank.
While its uses are limited under normal means, it has high effectiveness in the Holy Grail War due to being able to manipulate the Servant System. It is a blade of betrayal that will sever all connections between a Master and Servant by destroying every single rule that controls them, giving full control of the Master's Command Spells to Caster. She uses this on both Saber and Archer, causing Shirou and Rin's Command Spells to instantly disappear and transfer to Caster after their contracts are nullified. The Servants themselves must be the target, as it has no effect on Shirou's contract with Saber from simply stabbing his flesh. It is also capable of severing Angra Mainyu's hold on Sakura Matou after it is projected by Shirou.
Fate/complete material II: Character material - Weapons - Rule Breaker, p.137 English | JapaneseAll Spells Must Be Broken
According to Caster, “This is a sword of negation and betrayal, that nullifies every kind of magecraft in the world.” Capable of returning objects strengthened with magical energy to their former state and nullifying connections bound by contracts, it could be said to be the ultimate “anti-magic” Noble Phantasm. It is an effect suitable to the Noble Phantasm that is a manifestation of Caster’s nature as the “Witch of Betrayal”.
As the complex shape of the blade would suggest, it isn’t a very powerful weapon. It’s probably only about as strong as a normal knife. Traditionally, ceremonial knives were never meant to be used as weapons, and were designed as mere decoration. This knife was created under that school of thought.
Fate/complete material III: World Material - The Servants of the Fifth Holy Grail War - Caster profile, p.030-031
Master: Souichirou Kuzuki
Alignment: Neutral Evil
Noble Phantasm: C
Medea, the daughter of King Aeëtes of Colchis in Greece, was a priestess taught by Hecate, the goddess of witchcraft. While she was raised without any discomfort, her fate was shaken greatly by the arrival of the ship Argo that sought the Golden Fleece.
Having fallen under the goddess Aphrodite's curse to fall in love with Jason, the Argo's captain, Medea stole the Golden Fleece from her father and attempted to flee the country together with Jason. Furthermore, to stall her father's ship that had been following them, she violently tore her brother to pieces and scattered his remains in the sea. With this, Medea lost a home she could return to, and came to be despised as a "witch" by the people. After that, Medea, in order to let her beloved Jason sit on the throne, continued to murder any opposition with magic and strategy, but her practices disgusted Jason and caused him to gradually become adverse to her. Eventually, Jason switched his interests to another woman, going so far as to have children, which Medea could not forgive. She murdered his new wife and children with magecraft, the brokenhearted Jason undergoing a miserable last moment.
Thus, Medea's obsessiveness and cruelty made calling her a "witch" appropriate, but despite committing inhuman deeds, she herself received no reward from this. Theories have been left behind that Medea, who achieved an immortal body from her devotion to the study of magecraft, became the reigning queen of the paradise, Elysium.
Having mastered magecraft from the Age of the Gods, Medea possessed extraordinary power as a magus. However, because her physical ability as a Servant was the lowest, she was at a disadvantage in battles against Servants with high Magic Resistance. Consequently, she faced the battles with basic tactics, avoiding personal combat to the best of her ability and using her Dragon Tooth Warriors as pawns. Even in combination with Kuzuki, he was the attacker and she bore the role of support with magecraft. She laid out a stratagem to summon Servant Assassin (Sasaki Kojirou) and order him to guard the Ryuudou temple gate while she gathered mana and used her own Noble Phantasm to destroy the other Servants' contracts and make them her allies.
Territory Creation: A
The ability to create a territory to gather mana is a special characteristic of the Caster class. Medea's inherent magical capacity is not that great but by expanding her territory to collect mana, it becomes possible for her to use high level magecraft. Moreover, because the place Medea selected to establish her territory is the underground limestone cave where the Greater Grail was instituted, Fuyuki City's greatest holy ground Ryuudou Temple, it is possible to gather an enormous amount of mana in a short time. She secured Ryuudou Temple as her main base solely to reserve enough mana to get Altria and EMIYA to obey her after using "Rule Breaker" having summoning Servant Assassin independently. Furthermore, the influence of her created territory extends not only to Ryuudou Temple but also its surroundings. The rapid breakdown in the health of those inhabiting the periphery of the territory was because their life force was plundered for magical energy.
Because she understood the importance of the Ryuudou Temple territory the best, Sasaki Kojirou was ordered to guard the temple gate, and the interior was fortified so it could not be invaded easily. Furthermore, immediately following the beginning of the Holy Grail War, Medea almost never left the Ryuudou Temple, instead hiding on the grounds and raising mana. However, as soon as she made the judgment that she had collected enough magical energy for combat, she left the territory and turned on to the offensive.
Item Construction: A
High-Speed Divine Words: A
Golden Fleece: EX
Dragon Tooth Warriors
Type: Anti-Thaumaturgy Noble Phantasm
A noble phantasm with an ability quite different from the noble phantasms held by other Servants. Its capacity as a weapon is effectively nonexistant. However, it is capable of "transgressing" on all the magecraft of the targets it pierces. Targets it can transgress on are contracts made with magical energy, and life born from magical energy. They will be reset to the state before the magical energy was used. That is to say, contracts made with magical energy will be wiped clean, and life born from magical energy will immediately cease to exist. Therefore, even though its uses are rather limited, in the Grail War (which contains the Servant System) its effectiveness is high.
In fact, using this noble phantasm Medea was able to cut the contracts of Servants serving other Masters. Artoria and Emiya both served as her Servants temporarily.
 Fate/side material - Encyclopedia: Rule Breaker [Noble Phantasm] English | Japanese
Rule Breaker [Noble Phantasm]