The parallels between Masamune & Robio and Sephiroth & Nibelheim cases are so on the nose, it's not even funny.
FS ep. 2 chapter 2 makes a point of using similar expressions when describing Masamune's and Sephiroth's descent into madness and subsequent murder spree.
(Sephiroth): And that was it. He stayed holed up in the basement...reading and reading... like a man POSSESSED. (Masamune): Robio's tools and weapons were the responsibility of a single smith. One day, he took up his hammer as if POSSESSED, and poured all of his energy into crafting a remarkable blade.]
As a result, both men's behaviour is described as obsessive to the point of appearing possessed.
This possessed-like behavior eventually leads to a very specific type of carnage: the settlement is burned down, and the townspeople are slaughtered one by one. The opening sequence for the FS, episode 2, emphasizes the parallel by depicting a young Sephiroth standing amidst burning Robio in the same iconic pose as during the Nibelheim massacre. Furthermore, one of the first FS teasers cleverly superimposed Nibelheim footage over that of FS to create the glitching dejavu effect, almost as if history repeats itself.
In the case of Sephiroth, we can be fairly certain that his proximity to Jenova, combined with prolonged mental and physical degradation due to stress, lack of sleep, food, and so on, caused his mind to "slip" — or be hijacked.
What about Masamune? According to Alissa's account, as far as it can be trusted, the massacre was motivated by villagers coveting the masterwork weapon for themselves, which resulted in hostilities and infighting. Thus, it can be concluded that the problem began with the forging of a weapon, both the process and the end result.
(The villagers started fighting amongst themselves to claim the sword as their own. Some even attempted to sneak into the smith's home and steal it for themselves.)
Incidentally, to the point of being conspicuous, Alissa plants the idea that Sephiroth is deserving of a weapon as special as himself.
Eventually, Sephiroth makes a rather odd statement, that he feels the sword calling out to him. It's not the first time Sephiroth demonstrates some kind of extrasensory perception, despite vehemently denying it out loud.
Shortly before those purple orbs first appear on-screen in Chapter 1, Sephiroth mentions that he feels they're being watched. Later he makes an even creepier remark that he senses the presence of a strong will of some sorts.
The statement is linked to the fact that Masamune the swordsmith is thought to have been alive for the past 500 years, and that some power — allegedly the strong will that Sephiroth senses — is seemingly responsible for keeping him alive.
Excluding ShinRA's R&D vicious experiments with biological samples and various types of Mako, there's only one known case of keeping one's body in an undying state — and that is the case of Lucrecia, according to whom Jenova cells keep her from dying. Jenova itself is mentioned by the Cetra as not capable of dying during the Temple of Ancients exploration.
Moreover, why would Sephiroth sense a presence? Unless, of course, he shares a strong link to the source, perhaps on a cellular level.
I've already discussed the possible link between Masamune and Jenova here [read here].
(In ancient times, before the discovery of smelting, people forged weapons and tools from **meteoric iron**. Interestingly, there is a phenomenon known as telluric iron, derived from the Latin word for earth, "tellus," as seen in terms like "Telluric Fury" or "Telluric Scriptures.")
In short, in the distant past, people forged cold arms from using matter from meteors. Oddly enough, the most recent chapter mentions meteors, as Bachman relays a "hogwash" rumour that ShinRA creates their new breed of SOLDIER by scraping something (cells) off a meteor.
A strange introduction to the meteor subject, given that the general lore held that ShinRA unearthed an alien body and used it as a source of tissue. In the previously linked post I theorized that the meteor Jenova had arrived on splintered upon entering the atmosphere, and a piece landed in Wutai vicinity, centuries later to be discovered by Masamune and used in the forging of the sword. This splinter may have contained some of Jenova's organic matter. It fits well with the newly introduced concept of "special cells" being scraped off a meteor. On the other hand, the rumour clearly contradicts known lore; it could have been purposefully planted by ShinRA to obscure the true source of SOLDIER procedure in the hopes that it would be perceived as too absurd to be taken seriously.
Another similarity connects Robio's story to that of a "calamity from the skies". If Alissa's story is to be believed, a great battle took place in that area — a fight between Ancients and a vicious beast, similar to the story told by the Cetra hologram in the Temple of Ancients.
(But then, without warning, a fearsome beast invaded the region. Its attacks on the village claimed the lives of its people and their animals. The fiend existed only to slaughter.)
Specifically, the game depicts Cetra battling Jenova as a tentacled monster, a BEAST, that transforms into a human Goddess-like figure upon defeat.
Powerful fire magic was mentioned as being at work in Robio (fire being exceptionally good at eroding organic matter as well as preventing deadly bacteria/diseases from infecting new hosts), but more importantly, the village area is repeatedly mentioned in conjunction with the concept of "sealing". Angeal, Sephiroth and others initially conclude that the zone is abandoned, "forbidden," and "sealed" to prevent the truth about the heinous massacre from being revealed, but later hypothesize that the village was sealed together with whatever evil emerged there.
One detail that comes to mind is that since the Cetra's "celestial adversary" could not truly die, so it could not be defeated in a true sense, which is why the Ancients sealed/imprisoned it in geological strata (where it fell into slumber, per Temple of Ancients narrator).
So, here's the idea. The Temple of Ancients refers to "celestial adversary" as having been scattered in some way since the Age of Ancients [more on this here].
(“Heed well to our warning of that which is to come…<...> The reunion. When our adversary's scattered malignancy shall converge to plague the Planet once more.”)
Indeed, what if, upon arrival, Jenova was fragmented, either by meteor splintering or by design (Ancients cleaved it into pieces to weaken it, defeat it bit by bit, and eventually prevent the parts from converging into a single organism). Whatever the case, the Robio area may contain some of Jenova's organic remnants, such as a meteor (or its metallic core within Masamune's sword) or a body part sealed in the Petra-inspired temple. Masamune the swordsmith discovered it over 500 years ago and became exposed to its mind-altering properties, which resulted in corruption (perhaps unsealing and a letting the contaminant outside?), subsequent crazed behavior, and an eventual massacre. In its turn, the villagers' sporadic coveting of the blade and hostile behavior evokes some strange parallels with a "celestial adversary" sowing discord among men.
Interestingly, the settlers of Robio—I'd call them proto-Wutaians—are said to be Ancients or their descendants. The interesting part is that the descendants of those who defeated "the beast" appear to die in the same way the beast was slain: they are burned down, as if in vengeance.
And to point out the obvious: it oddly mirrors Sephiroth's deranged decision to burn down the town of Nibelheim, all while sticking to a paranoid delusion that humankind attempted to take something of his [The Planet]. Like the sword, like the world.
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@pen-and-umbra
