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According to this, Archer's weapon is based from a real weapon.

In the Holy Grail War, Shiro Emiya saw the servant Archer use those weapons. Then he traced them and used them himself. In the future, he will become the servant Archer and will be using those blades as his weapons.

Isn't it an example of bootstrap paradox? Where did he get the idea to use those weapons in the first place? Did the VN explain this?

  • Somebody else can probably elaborate better, but the basic idea is that the timeline Archer lived in is different than the one(s) we see in the VN. Shirou in the VN isn't the same version of Shirou that became Archer in some other timeline. – senshin Oct 18 '13 at 6:23
  • But the Archer in that different timeline experienced the war too right? So he must have seen the kanshou and bakuya and it could have influenced him to use it iff he experienced the war. If in the other timeline, he did not experience the war then the paradox is broken. – Keale Oct 18 '13 at 7:01
  • In the Holy Grail War that Archer-version Shirou experienced, Rin's servant was somebody else, not Archer. This is explicitly stated in some side material somewhere (not the VN itself), though I'm not sure where. – senshin Oct 18 '13 at 9:38
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    I think it's covered in the first fate/complete material, but not explicitly explained. It's mentioned that he likes them for what what they represent, since Kansho and Bakuya had no owner. – кяαzєя Oct 18 '13 at 14:55
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The Archer-EMIYA summoned by Rin is different from Shirou coming from a different timeline where the results of the Holy Grail war were different; the visual novel notes 3 key differences between them:

  1. Archer believed that he could Kill Shirou, thus erasing him from ever becoming a Counter Guardian. If Archer and Shirou were the same he would have known well that he would lose.

  2. Shirou learns Unlimited Blade Works from Archer during the war (in the Unlimited Blade Works route it's helped by a contract with Rin, while in Heaven's Feel it's helped by Archer's own arm). Archer, however, took ten years of training to set the foundations for Unlimited Blade Works and another ten years to reach to the point of being able to use it.

  3. The Shadow caused an undisclosed amount of destruction during the 5th War Archer was involved in. When he first saw it in Heaven's Feel, he put aside his grudge against Shirou and focused on destroying the Shadow as his duty as a Counter Guardian and also in a belief that he could prevent the same destruction again. It's unknown if Archer knew if the Shadow was Sakura or if his twisted life and Counter Guardian ideals (kill one to save many) made him no longer care if destroying The Shadow would result in Sakura's death.

Now, as for Kanshou and Bakuya, they do exist before Archer and Shirou, and their legend remained. However, what they look like was practically lost with the only known description being that Kanshou had a black tortoise shell pattern and Bakuya had a white wave pattern. Their actual shape was derived by Archer himself based on an assumption that they were cast swords common to the time period.

Now, the Projections Archer and Shirou use are inferior to the actual items. With weapons, they need to emulate the experience of that weapon's legends and its history. Shirou just copying "two swords that he admired from a guy he disliked" would make the swords weak, so given time he would probably research the swords and come to the same assumptions as what Archer did, and Archer would have researched the swords as a means to build up his arsenal in Unlimited Blade Works.

Since the true description on their appearance is somewhat lost, Kanshou and Bakuya would be the perfect test weapons on the concept of creating "existing weapons with a new form". This way, even though emulating the experience for the weapons would still make them weaker, being able to improve on them by changing their form and fixing their inherent weaknesses may help them become just as powerful as the originals. I can back this up as I've read somewhere that Archer has modified the design of Kanshou and Bakuya to suit his style so they are more customized.

  • so basically they're different and its not a loop because it started from the archer EMIYA w/c is not Shirou? – Keale Oct 21 '13 at 12:57
  • @Keale the key to the Nasuverse (Fate, Tsukihime, Mahou Tsukai no Yoru, Kara no Kyoukai) is that it's made up of parallel universes which can be linked via the 2nd Magic, While the 5th Magic used by Aoko was time travel Touko claims there should be more to it because time travel is also governed by the 2nf Magic so different timelines are also parallel universes – Memor-X Oct 21 '13 at 21:24
  • @Keale the Throne of Heros which is where the Servants like Archer come from for the Holy Grail Wars can be accessed in any universe which is why in Fate/kaleid liner PRISMA☆ILLYA the first set Saber Class card (King Arthur/Arturia) has Alter Saber's appearance even though the events of Heaven's Feel didn't occur in the Fate/kaleid universe as the Holy Grail Wars never occurred and the Ainsworth's would have had the Grail from the beginning so in their ritual they would not have created Avenger, tainted the grail and lead to Saber being consumed/corrupted though the actions of another family – Memor-X Oct 21 '13 at 21:29
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Ultimately I think Memor-X has the right answer, but I think there are some other relevant details that are worth remembering.

The Throne of Heroes exists outside of time and space, and the "EMIYA" in the throne has access to all events he has experienced during his summonings in all timelines, worlds, and realities. But normally a summoned Servant has more restricted access, coming only with those memorizes that the hero has internalized (and the knowledge the nature of the summoning has granted him, such as the Greater Grail System in Fuyuki). The "memories" of all summonings contained in the throne are likened to books: they're not internal to his spirit, but can be accessed much like you can just take a book off of a shelf and read it to learn what's inside it.

Now, there's something very special about Archer that interacts differently from all of this: he has a Reality Marble. These exist essentially outside the Throne, and is attached to the heroic spirit as he exists within the Throne. All summoned versions of him access this exact same reality marble. And his reality marble stores all weapons (and potentially other things, like Rho Aias) he encounters. So in order for FSN Archer to be able to project Kanshou and Byakuya (or Rho Aias, etc.) he needs only for some version of himself in some world's timeline to encounter it, and now they all have access to it, regardless of apparent chronology.

In reality things happen more like Memor-X says: rather than witnessing K&B in some fight, Archer is specifically said to have learned of these weapons which were said to be of Noble Phantasm quality but yet no hero was associated with them. These "fit" him better, as the best projections require you to project the skills and abilities of their wielders. The lack of such made K&B easier and simpler to create, as well as sort of fit the theme that EMIYA was "nobody", making them feel more natural and like they were "his".

As an aside, this reality marble is also essential to EMIYA's perspective and spirit warping, leading him to come up with the idea to try to kill (an earlier version of) himself in order to end his own existence. A Reality Marble is the user's inner world made manifest, and the experiences of his summonings impacted his reality marble and effectively carried on their memories to all versions, including the "true" version enshrined in the throne. You can see this by noting how there are significant differences between Shirou's and Archer's uses of Unlimited Blade Works. Archer's looks more apocalyptic and miserable, with a cloudy, ashen sky and large gears. Shirou's tends to have a more hopeful, brighter, bluer sky and far fewer (to no) gears. side-by-side UBW

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