[Sorry, I'll be more specific. It reproduces the concept of the user's murders as an attack. "Jack the Ripper" is an idea, the concept of a murderer who killed in a specific way, but whose identity was never known and who mysteries about their existence began to arise. Jack the Stripper embodies a possible identity of concept "Jack the Ripper" (the idea that it was a evil spirit of aborted children), just as F/SF Ripper embodies another possible identity of the concept of "Jack the Ripper" (that it was a group of people). They still have the identity of "Jack the Ripper", and are accredited with his kills, because in Nasuverse, collective belief can determine a NP's abilities, like how Seiramis never even saw or knew of the Hanging Gardens of Babylon, but everyone thought she did so that became her NP]
[I'm not saying Saver can't gain the ability. But I am saying it will be different to the original, because the Phantasm is based on the concept of the user's murders, and would instead based on the ideas of his own murders rather than those of Jack the Ripper. Llama doesn't have a way to link Saver the game character to Saver the story character in a way that lets him gain an ability that is the sublimation of Jack the Ripper's murders, seeing as he has never dismembered (or even killed) a woman in the mist. He only has a way to link Saver the game character to Saver the story character in a way that lets him gain an ability that is the sublimation of Saver's murders]
[He only has his own murders to work with, and those are different to StRipper's. The common threads (any 3 of which can become the conditions of the insta-kill) of Saver's murders are his victims were drunk, they were in a bar, they were all male, and they attacked him first.The way he killed them was by stabbing them with a broken glass bottle and beating them to death, so that is how his version of the ability would kill by stabbing the target with a glass bottle and beating them to death after the 3 conditions are fulfilled]
[BTW Good luck on your exam]