[Tendon-Changing Sutra]

The [Tendon-Changing Sutra] is a Sanskrit martial manual whose illustrations appear only when the pages are wet, concealing the method that transforms You TanZhi’s survival into a path of martial advancement. Its diagrams guide the body through energy-circulation postures that can neutralize external poison; yet the text’s demanding discipline, and the lack of ambition that allows You TanZhi to practice it without trying to master it, make the manual as much a test of the learner as a store of techniques.

The Manual and Its Hidden Instructions

The manual’s written directions and diagrams convey different parts of its teaching. Sanskrit explanations provide guidance for practice, while a sequence of illustrations depicts a naked monk in distinct postures, accompanied by small arrows that indicate how energy should flow. The diagrams are drawn with a special herbal solution from India and remain invisible while the pages are dry. Moisture reveals them; once dry, they disappear again. The concealment is therefore not simply a matter of a locked text or an unknown script: the essential visual instruction depends on the physical condition of the page.

That feature makes accidental contact decisive. You TanZhi’s tears and saliva wet the book when he is suffering from poison, exposing the figure that he mistakes for a Buddha who has appeared to save him. He tries the posture without understanding the image’s origin or purpose. Only later, when the soaked book shows drawings on every page, does he recognize that the figure is part of a concealed sequence rather than a supernatural visitation.

A Difficult Discipline

The sutra’s method is exceptionally demanding. Practicing it properly requires the dissolution of the distinction between self and others, along with the complete absence of desire to acquire martial arts. Those conditions undermine the ordinary pursuit of mastery: a practitioner must follow the method while not grasping at the power it might bring. Shaolin monks had studied the sutra for generations, but their sustained efforts produced negligible results. Because accomplished monks were eager to succeed and gain its benefits, the very qualities that made them serious practitioners could obstruct the mental condition the text required.

Its history includes an earlier, parallel case. A monk at Shaolin who had been ordained from childhood was dull-witted and considered crazy. When his teacher failed to master the sutra and threw it away in anger, the monk picked it up and practiced its contents for amusement. He became an outstanding martial artist, but never understood that the manual had made him one; after his death, the connection remained unknown to others. The episode anticipates You TanZhi’s progress: in both cases, practice succeeds not through a conscious campaign to claim the sutra’s power, but because the learner does not approach it with the usual desire for martial attainment.

You TanZhi’s Accidental Practice

After the Frost Silkworm’s poison has entered You TanZhi’s body, he uses the sutra’s energy-circulation method when the creature bites him. The method neutralizes the poison gas involved in the attack, while the silkworm feeds on his blood and its exceptionally cold poison is absorbed into him. You TanZhi has learned only one method, not the full art needed to expel the toxin. The venom therefore remains in his body, where it combines with the internal energy he develops through practice.

At first, he returns to the manual because he wants to activate what he imagines to be the silkworm’s spirit, not because he intends to study martial arts. While wandering in the wilderness, he carefully opens the soaked pages and discovers the previously hidden illustrations. Copying the postures and attending to the little arrows produces a sensation of the Frost Silkworm moving through his limbs. Stopping his concentration makes that sensation vanish; repeating the posture and focus brings it back. The diagrams thus become a practical guide through which he can feel and regulate the cold force within him, although he misunderstands what the process is doing.

Over the following months, the practice changes his physical abilities. His hands and feet become lighter and more agile, and he can jump farther and run faster than before. When a wolf attacks, he responds with an unplanned palm strike that kills it. He attributes the result to the silkworm’s spirit, but the account explains that his growing power comes from the sutra’s practice combined with the deadly Yin poison absorbed from the Frost Silkworm. That poison gives his internal energy an exceptionally fierce cold strength: what he treats as an uncanny presence is the effect of a manual and a toxin working together in his body.

Survival, Misunderstanding, and Consequence

The same combination of forces protects You TanZhi from poisoning. When Ding ChunQiu’s poisoned Beggar Society victims are found, Ding ChunQiu sends You TanZhi to examine them, expecting the exposure to kill him and conceal that Ding ChunQiu had been immobilized by a python and rescued by him. Instead, You TanZhi suffers no harm. His continued practice of the sutra and the Frost Silkworm poison integrated into his body make him resistant to the poison affecting the victims. Ding ChunQiu does not understand the cause and suspects that You TanZhi carries an anti-poison pearl or has taken a rare antidote; You TanZhi himself is equally unaware that the manual accounts for his survival.

The sutra’s effect is therefore indirect and morally unclaimed. You TanZhi neither grasps its theory nor recognizes his own growing ability, and he mistakes the signs of his progress for the work of the silkworm’s spirit. Yet the accidental circumstances of his study—his suffering, the moisture that reveals the drawings, and his interest in summoning the cold sensation rather than mastering martial arts—bring about a result that generations of determined practitioners could not achieve. The manual operates not as a simple promise of power, but as a concealed discipline whose instructions become effective through an unlikely alignment of the page, the body, and the learner’s lack of ambition.