The Red Vein Pupil Sword, it's not that only a child can refine it, or can only be refined in a child's body. Instead, it's a homophone, meaning pupil.
Yes, the pupil, is the pupil of the eye.
One must know that the Qi Gong of the Mystic Sect cultivates the Six Yang and Six Yin, the Twelve Main Meridians, all leading to the head, hence it is also called the Meeting of Six Yin, the Six Yang Leader.
Thus, this predecessor of the Sword Sect thought, if you run the sword energy once more all over the body from the twelve meridians and then shoot it out from the hands, feet, mouth, and belly, there would be a loss. Then why not make it straight to the point, wouldn't it be faster and stronger?
