Had some questions on Elemental Sight so here is the description.
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Elemental Sight - is a sensory ability that allows Tatsuya/Kazuya to connect to the Information Dimension and identify the landscape down to every detail. 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. Because of this, nothing can escape from Kazuya's/Tatsuya's Elemental Sight. Moreover, they can identify and examine each Eidos and Sequence and target them separately, irrespective of distance. It can be used to analyze any physical device or material at least down to the atomic level and his artificial MCA can dissect even the most secretive magic.
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Decomposition - Decomposition is also known as Dissolution, Disintegration and By itself, Decomposition can destroy areas, objects, or obliterate Sequences. With Elemental Sight, Tatsuya/Kazuya can identify the design of any Eidos or Sequence, then by using Decomposition, he can break down that design or structure entirely or selectively choose bits and pieces. For information bodies, such as magic spells, he can disassemble the design ie. (Gram Dispersion).
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Mist Dispersion - is an undisputed A rank destructive Decomposition spell that directly decomposes the physical structure of the information targeted. It works on inanimate objects as well as living organisms. It can decompose muscles, tissue, bone, even organs into basic molecules such as ions and the basic elements.
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Material Burst - is the ultimate Decomposition Magic. It has been likened to a magical equivalent of a nuclear warhead, and operates similarly on fundamental principles of physics; by converting matter into energy, it performs comparable destruction without the radioactive material fallout.
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Regrowth - Regrowth, also known as Restoration, is the opposite of Tatsuya's/Kazuya's Decomposition powers. Instead of breaking down an Eidos or Sequence, it can restore it. Coupled with Elemental Sight, Tatsuya/Kazuya can "read" the structural information of any object up to 24 hours in the past and with Regrowth, he can restore anything--organic or inorganic--to any point in that time frame. This means that he can restore maimed or fatally injured people, including himself, to a state before they were injured.
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Flash Cast - Flash Cast is the Yotsuba Family's secret Single Systematic Magic Casting Technique. It is made possible by mentally "carving" the images of the Activation Sequence into memory, allowing the user to recall the Activation Sequence directly from memory instead of a CAD to construct the Magic Sequence of the spell in the Magic Calculation Area of the brain. Brainwashing the user's mind in this manner allows for faster casting of single systematic spells that are not overly long or complex even without the use of a CAD. In Tatsuya's/Kazuya's case, they take Flash Casting to a whole new level. Because of Tatsuya's/Kazuya's unique ability to see even the Magic Sequence (which is different from Activation Sequence) of a spell, it is implied that as long they can remember the full structure of the Magic Sequence itself, not only can they bypass using the Activation Sequence of a spell from a CAD-like the rest of the Yotsuba Family, but they can also bypass recalling the Activation Sequence and even bypass the process of constructing the Magic Sequence in the Magic Calculation Area. This allows for true instantaneous casting of any single systematic magic spell that they see and remember as long as the spell is short (five processes or fewer).
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Gram Demolition - Gram Demolition is one of the two strongest counter magics within Non-Systematic Magic. It uses compressed Psion particles to blow away the Activation Sequence. It is simply a cannonball of Psions that has neither structure nor a Magic Ritual to modify an event, so it is not affected by Zone Interference. There are only two known "flaws" in the technique. First is that the Psions travel in the physical realm (as opposed to the Information Dimension) and thus have limited range. Second, Gram Demolition is a highly inefficient technique that requires an incredibly high Psion count, making it an incredibly rare technique. Like there other Decomposition magic, Kazuya/Tatsuya is also able to apply Gram Demolition on their own body for usage in close combat as Contact-Type Gram Demolition.
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Far Strike - Far Strike is a form of Gram Demolition developed by Tatsuya then taught to Kazuya. It works in the Information Dimension (Eidos) rather than the physical realm. Far Strike affects the astral form rather than the physical form.
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Gram Dispersion - Gram Dispersion is the other strongest counter magic within Non-Systematic Magic. Gram Dispersion is that: Gram (or Magic) Dispersion/Dissolution. This magic takes a Magic Sequence and decomposes it into a group of Psion particles without a meaningful structure. Gram Dispersion is considered impossible to use in the age of modern magic. To dissolve a magic sequence as required by Gram Dispersion, it is necessary to analyze the magic before the magic is activated. Since with the advent of CADs, spell invocation takes less than a fraction of the second, a full understanding of the magic being used before the magic has been cast was considered impossible. However, Kazuya/Tatsuya can use this because of his other ability, Elemental Sight.
Refrence - https://mahouka-koukou-no-rettousei.fandom.com/wiki/Shiba_Tatsuya/Powers_and_Abilities