Sphere Boundary (圏境, Kenkyō?, localized as "Concealment"EX) is a meditatively-based technique by which, through utilization of QiWP (one of the culturally-specific names of Od), one may perceive the exact conditions of the immediate environment, and make use of the resulting perception so as to adjust and minimize the noticeability and impact of one's existence.[1]
For those who have reached the pinnacle of this Skill, it is possible to synchronize with the World to such an extent that the human figure is rendered naturally indiscernible; it could be said that this state of oneness is the purpose for the pursuit of the Sphere Boundary to begin with. Vitrification functions on a similar basis.
Incidentally, this personal Skill is attained purely through the mastery of the martial arts, and is therefore unrecognizable to those trained solely under the system of Magecraft - being lacking in the telltale large-volume Magical Energy utilization that manifests in the use of Magecraft-based invisibility. As with the Tsubame Gaeshi attained by Sasaki Kojirou, the Presence Elimination effectuated by the Sphere Boundary exceeds the domain of human capability.
As with the technique of Presence Concealment, elimination of presence drops in efficiency in the circumstance that the user initiates an attack or poises for an offensive - even though invisibility is still effectively maintained. For this reason, opponents unfamiliar with the technique are still capable of "just barely evading" a seemingly invisible attack, provided he or she has the sufficient skill, talent, or experience, such as Mind's Eye (Fake), Instinct and etc. However, in the absence of any preparation for offensive action, a practitioner of the Sphere Boundary remains wholly indiscernible even on physical contact.[2]
| Rank | User(s) |
|---|---|
| A | Li Shuwen (Young Assassin) |
| B | Li Shuwen (Young Lancer) |
| Due to being summoned as a Lancer this time, his usage of Sphere Boundary has not reached as much as a complete disconnection as before.[3] | |
| Li Shuwen (Old Lancer) | |
| Originally, Even in the middle of a heated battle, he has the ability to completely disappear in the blink of an eye. Due to being summoned as a Lancer this time, Li Shuwen’s usage of Sphere Boundary has not reached a complete Presence Concealment like before. |
- ↑ Fate/EXTRA material
- ↑ Fate/EXTRA Drama CD
- ↑ Fate/Grand Order material III — Profile of Li Shuwen (Young Lancer), translated by Kinalvin at Reddit.
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