The Oath of the Barrel marks the decisive transformation of Yuan Guang’s solitary revenge quest into a disciplined but lethal apprenticeship under Arc. What begins as a request for training becomes an act of irrevocable self-binding: Yuan accepts that knowledge, ammunition, and advancement will come only at the cost of a vow enforced through his bullet-core and the Dao itself. The oath gives his later actions a second foundation beyond vengeance, while also exposing how closely cultivation, language, bodily risk, and violence are joined in this world.

Causes and Conditions

Arc agrees to train Yuan only after recognizing that he may be connected to the larger conflict surrounding Czar Zoa and Manhattan. She does not offer instruction freely. Her first condition is that Yuan must swear to destroy Manhattan, any students he has taken, and the plans associated with his Path. When Yuan objects that he is nowhere near strong enough, Arc removes the pressure of a fixed deadline rather than the obligation itself: he may need years or decades to reach Manhattan’s level, but he must continue working toward the goal and act when a reasonable opportunity appears.

The terms are dangerous because Yuan’s bullet-core is not merely a source of power. It keeps him alive. Arc makes the penalty explicit: if Yuan abandons the objective or passes over a reasonable chance to destroy Manhattan, the Unspeakable Vow will destroy his core, and Yuan will die. Her offer therefore combines mentorship with a threat that cannot be separated from the promised benefit. She will teach him how to make his own bullets, allowing him to overcome the ammunition shortage and potentially reach the Third Coil, but the knowledge is attached to responsibility that he cannot transfer to Arc.

Yuan understands that he may never receive another opportunity of comparable value. After considering the consequences, he accepts. His decision is framed not as confidence in victory but as a willingness to stake his continued existence on the possibility of becoming strong enough to obtain revenge and fulfill the larger obligation. His earlier death, burial, and near-return as a hungry ghost make the choice especially stark: having already faced the boundary between life and death, he deliberately places his living core under another form of judgment.

The Ceremony and Its Terms

Arc orders Yuan to place his hand on his bullet-core. She touches her own core, unveils her right arm, and warns him that he can still abandon the Path of the Gun. Yuan refuses to retreat, declaring that humanity is overrated. The exchange turns the decision into a bodily rite rather than a private intention. The oath is spoken through the organs that sustain both cultivators, making the core simultaneously witness, contract, and possible executioner.

Arc vows on her core to teach Yuan everything she knows, to make him her disciple, and to instruct him in cultivation. In return, she requires him never to be a friend to a Nuclear Path cultivator, to defeat Manhattan and those who follow his Path once he possesses the necessary power, to oppose their plans whenever possible, and ultimately to destroy Manhattan even if the effort takes centuries. The vow is therefore both personal and ideological. It creates a teacher-disciple relationship while placing Yuan in permanent opposition to an entire cultivation alignment.

Yuan repeats the oath with a slight qualification. He promises to defeat Manhattan and his followers once he has the power to do so, and to oppose their plans whenever possible or reasonable. This amendment preserves the goal while acknowledging the limits of his present strength and judgment. Arc accepts the formulation. The spoken words are not symbolic: an invisible force closes around Yuan’s bullet-core, and an emanation from the Dao fashions his promises into a chain. A faint pressure remains on his soul to ensure that he will not forget. Once the words are complete, the Unspeakable Vow follows him until fulfillment; withdrawal is no longer an available choice.

Training and Immediate Consequences

The oath changes what Yuan’s training means. Arc is no longer merely a powerful ally sharing techniques in an emergency. She becomes his teacher under a reciprocal promise: her knowledge is the pledged offering, and his future conduct is the pledged price. Her instruction includes the practical means to manufacture bullets, a skill that can solve the shortage threatening the conflict around Fleshmarket. It also opens a route toward the Third Coil and, with sufficient growth, toward Slash’s death. Advancement is thus tied to both material production and moral burden.

Yuan’s relationship with Orient shows the kind of disciplined practice that follows from this new commitment. While Holster rests after Yuan reassures her that no one will subject her to the Hitobashira procedure again, Orient helps him review mantras and mudras. Yuan practices the sequence associated with Archer’s Glory, finding that joining his fingers and speaking the words quickly enough is difficult under combat conditions. The sutra will increase the accuracy of his next projectile, but completing it costs time and energy when every breath matters. The oath’s promise of knowledge therefore does not create effortless mastery; it imposes a path of exacting practice in which hesitation can be fatal.

Moral Cost and Later Reinterpretation

The vow becomes more complicated when Yuan applies Arc’s teachings to the Fleshmarket ammunition crisis. He intends to arm the sects fighting over the settlement in the hope that they will destroy one another. The plan succeeds in the narrowest sense, but the sects’ mutual slaughter produces devastation on a scale he did not anticipate. Yuan cannot deny Arc’s accusation that he had hoped the warring factions would massacre each other, casualties notwithstanding. He is forced to wonder whether his actions helped draw the Gun to Fleshmarket, and admits that he had not expected the result to become so terrible.

This consequence reveals the oath’s central tension. Yuan swore to oppose Manhattan and the Nuclear Path, but power used against one danger can feed another. His promise does not automatically make his methods just; it binds him to examine the chain of consequences created by those methods. The oath begins as a weapon against an enemy and develops into a test of responsibility, especially when Yuan’s pursuit of revenge indirectly contributes to a catastrophe that invites the Gun’s arrival.

The same burden extends to Revolver. After the Gun’s coming is announced by a rain of qi-charged bullets over Fleshmarket, Yuan and Revolver shelter beneath layered Barriers. Later, when Revolver struggles against the bloodlust imposed by the Gun’s curse, Yuan remembers that Revolver has saved his life twice, first from Elder Polio and then from the Gun itself. Yuan refuses to let such debts go unpaid. Although the Perfect Shot prophecy remains cryptic, he decides to search for a way to free Revolver from the curse even if doing so delays his revenge.

That decision places the oath beside another obligation rather than beneath it. Arc’s vow demands destruction of Manhattan and the Nuclear Path; Yuan’s loyalty to Revolver demands that he protect an ally from becoming an instrument of indiscriminate death. The contrast becomes brutally clear when Revolver, after becoming the Gun, says that he follows unexplained impulses to their source and then turns laughter into screams. He remembers having once fought to free slaves, yet now kills masters and slaves alike, treating Scraps and cultivators, the young and the old, as identical at the barrel’s end. Yuan’s sympathy does not cancel the vow, but it helps redirect his strength away from simple escalation and toward liberation.

Narrative Significance

The Oath of the Barrel is a performative event in the strictest sense: speaking the promise produces the bond. Arc’s words establish the terms, Yuan’s repetition accepts them, and the Dao converts language into a physical and spiritual chain. The scene makes cultivation resemble contract law, religious ritual, and execution at once. A hand placed on the bullet-core, an oath sworn on that core, and an invisible pressure left upon the soul turn abstract intention into an enforceable condition of existence.

The event also establishes a pattern that governs the wider story. Death is repeatedly ritualized through funerals and last rites, combat through barriers and techniques, and authority through proclamations that alter bodies and landscapes. The oath belongs to the same world in which a murderer buries his victims so that they will not return as hungry ghosts, in which a sutra can determine the accuracy of a bullet, and in which the Gun announces itself through millions of projectiles. Against that background, Yuan’s promise is neither metaphor nor ceremonial decoration. It is another mechanism by which words direct violence.

Most importantly, the pact gives Yuan a durable counterforce to the Gun’s inherited cycle. The Gun’s curse turns Gunsouls into beings of point, direction, aim, and target; the oath gives Yuan a chosen direction that is meant to exceed reflexive killing. Yet the vow remains dangerous because its enforcement is absolute and its language cannot guarantee moral clarity. Yuan must become stronger without becoming merely another tool of destruction. Arc’s final demand that the Nuke, the Gun, and the Blade be ended, together with her later sacrifice, makes the oath’s promise echo beyond the training scene. It becomes the foundation for Yuan’s continuing struggle to decide what a gun should serve, whom power should protect, and whether a vow made for revenge can ultimately be transformed into responsibility.