Sphere Boundary (Extreme) (圏境（極）, Kenkyō (Kyoku)?) is a Skill where one uses their own qi to feel their surroundings, or to erase their own presence.
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User(s)
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| A-
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Li Shuwen (Old Assassin)
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| Reaching mastery in this skill allows one to become one with nature, even giving one the ability to become completely invisible. Due to his old age, Li Shuwen has achieved further mastery in this technique. Even in the middle of a heated battle, he has the ability to completely disappear in the blink of an eye.[1]
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