It seems to me that Decomposition works by erasing the fabric of reality that underpins an object. So, can it affect anything whose "material concept" either doesn't exist in the information dimension or if said concept is mapped onto a location that is explicitly "outside of reality" itself?

  • From my understanding, Decomposition as the name suggests doesn't erase the concept or fabric, but rather splits it into the most basic components. Apart from that, what do you mean "doesn't exist in the Information dimension" or "outside of reality itself"? All physical objects would definitely exist in the information dimension, and magic itself operates by altering the Eidos. Do you have any example for something that doesn't have a corresponding Eidos or Information Dimension image? – TheGamer007 Nov 7 at 15:17
  • The question was asked on my part, mainly for the sake of argument for say, character battles between Tatsuya and other franchise characters. If Decomposition works as you describe, then wouldn't characters who have demonstrated a resistance or immunity to physical disintegration be able to resist or block Decomposition from affecting them? To address your questions, what if a character is in a completely dimension or universe from Tatsuya and attacks him from that location? Does that character have "data" in the Information Dimension? It doesn't seem to be the case. Continued in next comment. – Linwood Sherman Nov 8 at 3:42
  • Continued from previous comment. Also, what if the character can manipulate information, such as by preventing someone from remembering it when he comes in contact with it or by erasing it from a person's perception? Can those characters block Decomposition because they can theoretically alter their own information in the Information Dimension and prevent Tatsuya from perceiving or "reading" it? What if a character, by the canon of their franchise, has a "concept" that exists in another dimension altogether? Continued in next comment. – Linwood Sherman Nov 8 at 3:47
  • Continued from previous comment. Does that preclude the character from having any data in the information dimension, because their own franchise already states that their concept is located elsewhere? How about characters that are multidimensional or comprised of multiple dimensions pesonified? Can Tatsuya even affect such people, since Decomposition apparently only affects matter and not entire dimensions? Can Tatsuya even decompose entire dimensions? Can Tatsuya even see into other dimensions or universe apart from the Information Dimension using Elemental Sight? – Linwood Sherman Nov 8 at 3:49
  • "The question was asked on my part, mainly for the sake of argument for say, character battles between Tatsuya and other franchise characters." while this might be interesting, I'm afraid this might get into opinion-based (any answers are potentially correct, no objective answer) since there might be no concrete case that can prove/disapprove this. It's better to limit the question and the answer based on in-universe facts. Given its Q&A nature, Stack Exchange is unfortunately not a good place for open-ended/hypothetical question. – Aki Tanaka Nov 8 at 7:45

After having seen the anime and read some about the magic you mentioned, here's my take to your question:

It seems to me that Decomposition works by erasing the fabric of reality that underpins an object.

No, it does not. TheGamer007 is right in saying that Decomposition 'doesn't erase the concept or fabric, but rather splits it into the most basic components.' In the wiki, it is described as something that 'interferes with structural information.' Furthermore,: "...after identifying the design of any Eidos, Magic Sequence, or object, he can decompose the design. For physical objects, he can translate the physical object into signals, and then erase the base design at his leisure, breaking the inter-molecular bonds and so decomposing or disintegrating the target. For an information body (Magic Sequences), he can directly disassemble the design..."

Can it affect anything whose "material concept" either doesn't exist in the information dimension or if said concept is mapped onto a location that is explicitly "outside of reality" itself?

From my understanding, Tatsuya is able to use Decomposition because of his another ability called Elemental Sight, which is able to access the Information Dimension and obtain information about the Eidos of his target. 'Every person and object imprints their Eidos within the Information Dimension, and every system and type of magic projects Sequences onto the Eidos through it.' Your question assumes 1.) there is another dimension which can hold 'material concepts' other than the Information Dimension and 2.) that it is possible for an object's/person's Eidos to be mapped only in this dimension in the first place. Unless this theoretical 'second dimension' exists and that an object's/person's Eidos is only mapped here, then the scenario of an object or person existing without an Eidos in the Information Dimension is not possible in the first place. If, however, those two conditions are met, then, theoretically, Decomposition magic will not work on said object/person. However, if said object's/person's Eidos existed in the Information Dimension before it was moved to this second dimension, then in the case of Tatsuya, he can still harm them because of Elemental Sight. I'll explain it below.

If anyone that could, theoretically, attack Tatsuya from other dimensions/universes OR could hide their material data or locate it elsewhere apart from the information dimension, can they protect themselves from Decomposition?

First, as mentioned here, anything with a physical body will always have their Eidos imprinted in the Information Dimension. If that another dimension has its own Information Dimension then, yes, they cannot be harmed by Decomposition. However, if said another dimension shares the Information Dimension with the current dimension that Tatsuya is in, then, they can be harmed by Decomposition. Then, Could they hide their material data or locate it elsewhere apart from the information dimension to protect themselves from Decomposition? Yes, they can hide their material data and even place it in another dimension but Tatsuya can still harm them. Why? I answer this in the assumption that the person's/object's Eidos was formerly located in the Information Dimension. If this was the case, then Tatsuya will notice and can pinpoint where this 'lack of information' occurred. As mentioned here regarding Elemental Sight, '..only phenomena that obscure a target's information can offer some level of protection, but even then, such protection can be destroyed by some form of Decomposition, either singly or as part of a Loop Cast series. Completely hiding one's information does not prevent detection as Tatsuya will notice the lack of information..'. Therefore, it can be said that he can still locate said person/object and cast Decomposition magic on them since Elemental Sight works 'regardless of distance.'

  • Alright, then can Decomposition affect characters who have shown immunity or resistance to being disintegrated? You seem to imply that Decomposition simply breaks down an object into atoms by destroying molecular bonds. In that case, can a character who can resist or block attempts to disintegrate him (being immune to physical disintegration) be affected by Decomposition? Continued in next post. – Linwood Sherman Nov 8 at 23:23
  • Continued from previous post. Regarding your point about "eidos imprints", if a character with time manipulation can hide the fact that his data ever existed in the information dimension in the first place (and can erase all traces therein), can Decomposition harm him? By his power, his data "never even existed" in the information dimension to begin with. Also, can characters who are high multidimensional (comprised of multiple dimensions personified or existing across many dimensions) be harmed by Decomposition? It seems to only affect matter, and dimensions are not "matter" so to speak. – Linwood Sherman Nov 8 at 23:28
  • Also, consider a character like the Doctor (from Doctor Who) who can do this (youtube.com/watch?v=1_UU_qWLvm4) to any information that concerns him (even stuff that is quantum stored and existing on "12 levels of reality"). He can probably do the same thing to any information about him in the information dimension (meaning Tatsuya will instantly forget information about the Doctor the moment it is learned). Is that a feasible defense against Decomposition? – Linwood Sherman Nov 8 at 23:33
  • 'You seem to imply that Decomposition simply breaks down an object into atoms by destroying molecular bonds.' I'm not implying. It is what it is. You can read the wiki and their references if you still doubt me. 'Can a character who can resist or block attempts to disintegrate him (being immune to physical disintegration) be affected by Decomposition?' Yes he/she could but since no such character exists, the only known counters are for Mist Dispersion, for the other Decomposition magic, no counters are known. mahouka-koukou-no-rettousei.wikia.com/wiki/Mist_Dispersion (Countinued below) – W. Are Nov 9 at 3:25
  • 'Continued from previous post. Regarding your point about "eidos imprints", if a character with time manipulation can hide the fact that his data ever existed in the information dimension in the first place (and can erase all traces therein), can Decomposition harm him? By his power, his data "never even existed" in the information dimension to begin with.' No, Decomposition can't harm him/her/it then. But where would his/her Eidos be placed if not in the Information Dimension? Again, as I mentioned, unless such 'second dimension' exists, this character is not possible in the MKNR world. – W. Are Nov 9 at 3:31

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