History WMG / FateKaleidLinerPrismaIllya

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Illya will save word because she is idealistic, optimistic and never give up. In short she have HOPE. It isn't cliche it is brilliant writing using myths like Fate I tend to.[[spoiler: What is in Pandora box except for plagues? Hope and it was never released in Miyuverse. World is literally hopeless.]]

Before the final battle, the Miyuverse Shiro gave Kuro one of the Origin Bullets from Kiritsugu’s Thompson Contender. In Fate/Grand Order, we learned that EMIYA Alter essentially created Unlimited Lost Works by combining his sword projections with the Origin Shot, and now Kuro is poised to do the same thing.

[[WMG: Tanaka is a [[Literature/AngelNotes Liner.]]
It's in the title of the show, after all. She has a demonic sword formed from her arm, after all. How she got in Miyu's world is unknown.

[[spoiler:I'm personally hoping for Tiamat because I feel like Angra Mainyu would be too obvious, but this might be crossing some religious wires since Pandora's Box is a Greek mythos and Tiamat is Mesopotamian mythos.]]

[[WMG: The giant black cube contains [[spoiler:not Angra Mainyu, but [[VideoGame/FateGrandOrder Tiamat]]]].]]
'''Huge spoilers''' for those not up to date on ''PRISMA✩ILLYA'' and ''VideoGame/FateGrandOrder'', '''especially''' if you're only watching the [[Anime/FateGrandOrderAbsoluteDemonicFrontBabylonia the Babylonia anime]] and have not played through/watched the game's version of events.

[[spoiler:As of now, we know that Erika is actually Pandora, and the giant black cube is her titular Box. In the original legend, the Box contains all of humanity's evils and disasters, but in this story it's pointed out that the tale of Pandora's Box has always been abstract, i.e. "a disaster to one person could seem like a blessing to someone else". The Box in this story also produces "Grail Mud", which is awfully strange for something that supposedly has no connection to the Holy Grail - and yet while Angra Mainyu (the original evil facet of the Holy Grail) would fit the "all of humanity's evils" criteria for the original Pandora's Box legend, in the Miyuverse this would likely not be called a "blessing" by ''anyone'' (except maybe [[DeathSeeker Pandora herself]]) since it would likely just finish the world off.]]

[[spoiler:But for anyone familiar with the events of the Babylonia Singularity in ''Fate/Grand Order'', there is ''one'' other being that produces "Grail Mud" - Tiamat, in the form of her Chaos Tide. Tiamat is the Primordial Mother, having [[TheMaker created all life]], but was sealed away by her offspring because she could essentially ''overwrite'' the world they'd built for themselves. In ''PRISMA✩ILLYA'''s continuity, the gods created Pandora as the key to her Box and told her to open it on the day the world ended. If Tiamat is sealed in Pandora's Box, then breaking the seal while life still thrived would obviously be disastrous. But if life was going extinct (like it is in the Miyuverse right now), then it would only make too much sense to open the box and release Tiamat to reset the world, so by that point it would be a good thing.]]

[[spoiler:Either a blessing or a curse, heralding the end of the world, "Grail Mud" - Tiamat is the only being in established ''Fate'' lore that checks all of the boxes, so it would make sense if she were inhabiting the literal Box. Though I'll admit that I have no flipping clue how Illya and co. would contend with Tiamat, but after seeing Gilgamesh's [[LimitBreak Enuma Elish]] get overpowered, I'm willing to engage in some WillingSuspensionOfDisbelief.]]

It's why Kuro needs Illya to provide her with prana. Originally before Kuro, Illya seemed capable of doing a lot of heavy magic (like her first install with the Archer card) but after she split with Kuro, while she still has a respectable number of magic circuits, the lion's share went to Kuro. Theoretically, if she had all of her magic circuits, she might have been able to do her Zwei form safer. Illya's body still stores and regenerates large amounts of mana but doesn't have the magic circuits to use it in large amounts without overloading her circuits whereas Kuro might not have any mana reserves or very little and needs to replenish them from other sources.