Gradation Air (グラーシヨン・エア, Gurāshiyon ea?), more commonly known as Projection (投影, touei?), is a Magecraft that materializes objects, in accordance to the caster’s imagination, through the use of prana. Gradation comes from the fact that the created object slowly fades away after being created, and Air is an allusion to the fact that said object is made out of “nothing”.
The concept behind this Magecraft is rather simple, to shape prana into the material composition and design of an object that is being imagined by the magus. The item is not everlasting, as it is recognized by the world as a phantasm that doesn't belong in the natural world, and it will be erased as an inconsistency. The better the image in the caster's imagination, the more stable and longer lasting the object will be, and it can be further improved by having technical knowledge of its construction, such as a blueprint, or having materials to overlay the desired shape upon.
Projection is considered to be an incomplete and mostly useless Magecraft by most modern magi for anything other than immediate activities, such as projecting a sacrificial item to be forsaken in a ritual. It is generally easier and more practical to create an object that will not fade away with appropriate techniques and raw materials. While Gradation Air is a more complex form of Reinforcement, it is ultimately inferior and less efficient. Comparatively speaking, if a magus uses Projection to recreate a sword while spending ten units of prana in the process, he will get a weapon with an overall strength of three or four. Meanwhile, if he uses that same prana to reinforce an existing blade, he will get a weapon with a power of twenty or thirty. It is also possible to apply Reinforcement to improve the capacities of the projected item.
Projection (Trace Version)Edit
Projection (Trace Version) (投影（トレース版）, ?) is the personal variation of Gradation Air that Shirou Emiya and Archer use, referred as Tracing due the unique aria, "Trace On", that is used for its activation. Tracing greatly differs from normal Projection in the fact that not only does it reproduce the shape and substance of an object, but also its entire history as well. Objects created with tracing are slightly inferior to the originals due to the fact that only so much information can be gathered by sight alone, and Noble Phantasms are degraded by an entire rank. The only exception to this is Avalon, which Shirou can replicate perfectly due to his body preserving a complete record of it after having been fused with it for over a decade. Objects need to be seen directly in order to be traced, as even with a blueprint and materials, The Jeweled Sword of Zelretch was impossible to trace. Objects seen through shared memories, such as The Jeweled Sword of Zelretch and Caliburn seen through Justeaze Lizrich von Einzbern and Saber's eyes can be properly traced.
Shirou and Archer mentally divide the process of Tracing into seven steps, which include:
- Judging the concept of creation
- Hypothesizing the basic structure
- Duplicating the composition material
- Imitating the skill of its making
- Sympathizing with the experience of its growth
- Reproducing the accumulated years
- Excelling every manufacturing process
Due to the extra effort, it is possible to produce incredibly stable ordinary items that can remain in the world for hours after their creation. Furthermore, whenever replicating mystical objects such as Noble Phantasms, it is possible to faithfully copy their special abilities and any skill that its owner performed are available for use. The reason this is possible is due to the nature of Unlimited Blade Works, which at a glance, records the history, composition, and design of what the user sees, and then provides the necessary materials needed to reproduce them. The actual reproduction happens within Unlimited Blade Works, and is then brought into the real world at need via Projection. If the image of the projection is interrupted in any way, the item will be physically weak and shatter upon physical impact. It is also possible to apply Reinforcement to objects recorded within Unlimited Blade Works, as demonstrated with Caladbolg II or Kanshou and Bakuya.
- ↑ 1.0 1.1 1.2
 Fate/side material - Encyclopedia: Projection [Magecraft], p.067 English | Japanese
A sorcery that uses magical energy to materialize a mirror image of an object.
As Rin mentioned in the story, it's not very efficient.
That's because, if you're making a replica of something, rather than using projection it's easier and more practical just to gather the materials and build it yourself.
Normally, it is only used to project a substitute for an item that has already been lost, and for just a few minutes within one's own time axis.
At any rate, since Gradation Air is just supposed to be a short-term rental of the item's outward appearance, you can see why the version used by Shirou and Archer is completely ridiculous. It's no wonder that Rin wanted to kill him when she saw his shed.
Of course, Shirou can only project things that are related to weapons in some way – or more specifically, swords. Modern weapons are off limits.
Well, technically he can pull out shields or armor, too, if he strains himself to his utmost limits, but the effects only last for an instant and the cost is enormous.
 Fate/Side Material - Encyclopedia: Reinforcement [Magecraft], p.058-059 English | Japanese
An elementary spell that was extremely difficult to master.
Even though elevating the target's existence through the infusion of mana was the basis of all magecraft, due to the high degree of freedom and lack of concrete protocols, there were very few users who could reinforce everything.
Shirou of course was only a half-baked user who could only reinforce weapon-related objects.
Since Reinforcement enhanced the target's meaning of existence, knives would become sharper, food would become more nutritious, and maids would become more moe.
It was impossible to reinforce something that was exceedingly vague.
By the way, it was difficult to infuse another living being with one's mana, thus Reinforcement of another human was a spell of highest difficulty.
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