Jack The Ripper's powers and abilities
Her weapons include four strangely-shaped knives, two butcher's knives, and a black, bloodstained scalpel. However, in addition she possesses an unknown number of other black scalpels that she uses as throwing projectiles. She is shown capable of holding up to four per hand for a total of eight and throw them simultaneously. Compared to other Servants who have garnered legends over centuries and millennia, she is a young Heroic Spirit of only one hundred twenty years. Even with the fame she garnered that gives her the necessary "monstrosity" befitting of a Heroic Spirit, she cannot hope to match those worshiped as gods and heroes with such little history of her own. She can be called a completely unknown Servant, and she has never participated in the Holy Grail War. This suits Hyouma's plan, as he wishes to avoid the weakness granted to those of the Assassin class. It is normally fixed that only one of the Hassan-i Sabbah can be selected as Assassin, so it is possible to develop countermeasures against them simply by having their identities as Assassin exposed. With a different Heroic Spirit, it is possible for him to best make use of the class. She has the qualifications to be summoned as either Assassin or Berserker.
She can utilize the evil spirits comprising her to possess children to act both as her soldiers and hostages.[24] If her heart is pieced, the spirits are released from the focal point that is "Jack the Ripper", like a stream of black mud-like mass from her mouth.[25] These spirits attack the nearest living being to trap their victim in a illusion of Whitechapel formed from their memories. It is an inner world that embodies Assassin's origin, and shows the ugliness of humans. The illusion is destroyed if the spirits are exorcised.[26]
Due to being a murderer, their efficiency as a “soul eater” is extremely high, and even with Reika who was an ordinary person and virtually unable to provide any Magical Energy as a Master, they were able to continue maintaining their first-rate battle power by continuing to kill others for Magical Energy.[6] Reika cannot act as Jack's main magical energy supply due to not being a magus, and while the cost of an Assassin-class Servant is less draining than a Saber or Berserker, she still has to acquire it from other sources. She eats humans souls to replenish herself, feeling considerable hunger when low on energy. Due to her nature as chaotic evil, an existence that preaches chaos in the face of order while carrying out evil deeds, souls of the same nature are more easily digested. Eating evil people is the best for her because it is more polluted and delicious. Hyouma works well for her, especially his quality as a magus. She sucks out all of his blood, leaving him much like a pile of dead leaves with the exception of the hand that had his Commmand Spells. She mainly eats the hearts of her other targets instead of devouring them fully.
Skills
Class Skills
Presence Concealment (A+ Rank): A skill suitable for espionage activities, hiding one's presence. If one completely hides their presence, discovery becomes nearly impossible, even for servants. When launching an attack, the rank of the presence concealment greatly decreases, but this weakness is compensated for by "Murder on a Misty Night", allowing for a perfect surprise attack.[2][3][4]
Mad Enhancement (C Rank): If summoned as a Berserker, she gains this skill. Increases all parameters in rank with the exception of Luck and Mana, but removes the ability to speak or have complex thoughts. As a Berserker, she is only active at night, with The Mist always active, and will attack anything that possesses mana.[4]
Personal Skills
Murder on a Misty Night (A Rank): Since her characteristics are that of a murderer rather than an assassin's, she, the assailant, always gets the first move against the enemy, the victim. However, this only applies at night.[2][3][4] During the day, a luck roll is required. Jack the Ripper's victims are believed to have all been attacked while off-guard.[4]
Mental Pollution (C Rank): Mental Interference magecraft has a medium chance of being blocked.[3][4] If her Master has an evil alignment, or is cruel to her, this mental pollution gradually rises. Her chances of blocking magecraft will increase, but her already broken spirit will begin to irreversibly corrupt.[4]
Information Erasure (B Rank): The very second battle is finished, eye witnesses and opponents' memories about information concerning abilities, True Name, appearance etc disappear.[2][3][4] Even if the battle took place in broad daylight, or was recorded on a device such as a camera, this skill will still take effect. To counter this, one must deduce her identity from evidence left at the scene.[4]
Surgical Procedure (E Rank): Using her blood-stained scalpels, she can provide medical treatment to the Master as well as herself. It looks risky, but she manages somehow.[2][3][4] Can heal her Master or herself using a blood-stained scalpel. The techniques are from 120 years in the past, but are improved a little with mana. Jack the Ripper killed victims in ways that would require anatomical knowledge, such as removal of specific organs.[4] It allows her to heal Reika's stab wounds. Reika finds that her wounds have been stitched up, but it is done in a crude method looks like the black thread is creeping about haphazardly like an earthworm. While it seems like her wounds may not even be closed properly, the bleeding and pain have completely subsided. The same chaotically done surgical procedure is also able to keep Sagara alive after Jack cuts off both his jaw and one of his hands.
Noble Phantasms
Her Noble Phantasms are The Mist and Maria the Ripper.
