Reality Marble
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A Reality Marble (固有結界 koyuu kekkai, innate bounded field) is the common sense of the spirit world that the demons possess, but now, it is possible to achieve one as an innate bounded field.
As a sub-category of Marble Phantasm, it is possible to reshape reality into the vision of the bearer through a bounded field. It is a magecraft that comes close to being real magic, and is a category that was banned by the Association of Magecraft.
Unlike Marble Phantasm, it isn't possible to make any transformation you want: its only purpose is to do the one thing that defines the practitioner. On the other hand, that thing can be something unnatural.
The Reality Marble allows the creation of a world that obeys a set pattern of rules. However, there are limitations in how it is a way to create a spiritual world. In principle, it is something that only belongs to demons and spirits, but it is possible for an individual with high magic abilities to realize one with time. The World will naturally try to crush such a bounded field if it isn't made by a spiritual entity. Also, in the end, only a limited number of people are capable of realizing a Reality Marble.
The majority of the 27 Dead Apostle Ancestors seem to be capable of realizing one.Nero made his Reality Marble as his own body, so that the World will not try to crush it.
Source: Tsukihime Dokuhon PlusPeriod dictionary entry (p.179)
[edit] List of known Reality Marbles and their owner
- Depletion Garden (Yumizuka Satsuki)
- Lair of the Beast King (Nrvnqsr Chaos,Yamase Maiko)
- Nevermore (Grandsurg Blackmore)
- Night of Wallachia (Zepia Eltnam Oberon, AKA Night of Wallachia)
- Overload (Michael Roa Valdamjong)
- Parade (Fina-blood Svelten)
- Unlimited Blade Works (Emiya Shirou, Archer)
- Crystal Valley (ORT)
At some point prior to his death, Brunestud of the Crimson Moon created a Reality Marble that was implanted into his children, the True Ancestors. That Reality Marble allowed him to take over the body of a True Ancestor once the power of said Ancestor reached a point that was comparable to his own. In other words, it granted him a form of resurrection through spiritual possession. At the present time, the most promising candidate is Arcueid, who is able to recreate his former lair, the Millenium Castle Brunestud, with the power of her Marble Phantasm. The castle itself was originally part of the Reality Marble, and as this particular Reality Marble can be inherited due to its nature, the ability to actually summon it (through Marble Phantasm) is the proof that you are the heir of Brunestud.
Ionioi Hetairoi, "the Army of the King", Noble Phantasm of Alexander the Great, is a variation of a Reality Marble, as it is a combined Reality Marble of Alexander and his whole army.
Emiya Kiritsugu has the ability Innate Time Control, for which the concept should fall in the Reality Marble category, but it isn't classified as a RM innate to him.
ORT has an ability that is described as something "similar" to a Reality Marble, called Crystal Valley.
Hisui in Melty Blood Act Cadenza has ability to create Fake Reality Marble, called Guru Guru Hisui World
