Bai Yue

Biodata

Feature	Details
Name	Bai Yue (白月)
Alias(es)	Hero King; First Emperor; King Solomon; God Eater; God of Suspicion; Pale Rider 195 212 240 386 698
Species/Race	Human, by his own definition and self-identification 503
Gender	Male
Affiliation	Fate Execution Mechanism; Hestia Familia 398 700
Occupation/Role	Hero King; creator and core constructor of the Fate Execution Mechanism; adventurer 398 695
Status	Active
First Appearance	Chapter 89 89

Power Progression

Stage / Realm / Level	Chapter	Notes
Pale Rider / Pestilence	240	Directly replaces the Pale Rider’s role through remnants of the God of the Bible, gaining its abilities without needing to roleplay the card. Its Noble Phantasm and Authority-granting functions have conditions. 240
Evolution toward Death	256	His Pestilence power begins evolving toward Death after absorbing Divine Authority; he arranges hunts for Disobedient Gods to acquire more Authority. 256
Underworld Authority / Netherworld	326, 332	Takes Pandora’s Ring of Usurpation to pursue the Underworld’s Authority. He later manifests the Netherworld Noble Phantasm, dispersing 967 Underworld spaces and using sealed Authorities as fuel against Fate. 326 332
Fate	332, 334	Reaches the true mass of fate after destroying its “carpet” and subsequently obtains Fate. He notes that this does not make him omniscient or omnipotent, though it is a necessary step toward that realm. 332 334

Background / History

Bai Yue first appears protecting Aisha from a demon, physically overpowering it and countering its black flame with a larger black flame of his own. Soon afterward, he catches a Spear of Light launched at him by a black-haired church-affiliated girl, demonstrating that he is already far beyond an ordinary human combatant. 89 92

He begins recruiting powerful beings into the Seventy-Two Pillars of Demons. When Yasaka becomes a target of the Hero Faction, Bai Yue offers her a card that can make her one of his Demon Gods, stating that the decision is hers and that he will not force her. 130

After arriving in the Heavenly Realm, Bai Yue takes an active role in examining the core system left behind by the previous God of the Bible. He identifies angels and believers with problematic faith, investigates systems for angel rebirth, and considers developing the Divine Artifact System to locate Divine Artifact holders. 195 196

His pursuit of Divine Authority leads him into conflict with Disobedient Gods. During his battle with Athena, he uses Veleslana’s tenth incarnation, the Golden Sword, to sever Divine Power and seal her three Divine Sparks. He later pursues the Authorities of the Underworld and Fate, using them to expand the scope of his Noble Phantasm and challenge the Fate Domain itself. 266 326 332 334

Appearance

Bai Yue outwardly appears as a young man, though several characters perceive him as far older, more experienced, or more dangerous than his appearance suggests. 415

• An eighteen-winged Mark covers more than half of his back and resembles an artificial tattoo rather than a normal Demon Slayer Mark. 426 427
• The Mark grants heightened physical ability and senses when activated. 441
• His body can be visibly damaged or weakened despite his regenerative ability; a curse later causes it to rust and become stiff. 696 720

Personality

Bai Yue is calculating, curious, and highly pragmatic. He routinely studies unfamiliar worlds, power systems, mythologies, and people, often treating dangerous situations as experiments or opportunities to gather information. He is willing to deceive, manipulate, or exploit an opponent’s weakness when it serves a larger objective. 201 256 326 638

He is also openly teasing and shameless in interpersonal situations, frequently provoking reactions from those around him. His behavior can be domineering, particularly when he holds overwhelming power over another person. 395 473 500

Despite his ambitions, Bai Yue retains concerns about losing his humanity. After obtaining Fate, he reflects that becoming an omniscient and omnipotent existence might turn him into an emotionless “program.” He ultimately defines himself as human by personal conviction rather than physical limits. 334 503

Abilities & Skills

Fate Execution

Bai Yue possesses the skill and title Fate Execution, which is connected to his role as creator of the Fate Execution Mechanism. In Orario, this ability is suspected of contributing to a chain of seemingly accidental deaths, though the Guild cannot establish evidence against him. 398 698 700

• Can interact with and alter fate-related structures after obtaining Fate. 332 334
• Severs fate-related threads, including one that prevented Athena from speaking an identity aloud. 307
• Is not equivalent to unrestricted control over all worlds or omniscience. 334
• Its effects can be difficult for observers to prove, allowing incidents to be ruled accidents. 695 700

Magic and Dimensional Manipulation

Bai Yue is an exceptionally capable spellcaster with extensive knowledge drawn from multiple worlds and systems.

• Generates black flames capable of countering demonic fire. 89
• Uses overwhelming magical power to erode and nullify an opponent’s yokai fire before it can detonate. 129
• Recompiled Kuroka’s time-manipulation spell to create a duplicate of himself. 201
• Creates temporary dimensions resembling the Time Temple. 201
• Manipulates multiple timelines and simultaneous engagements, an operation Kuroka considers extraordinarily difficult. 212
• Learns and improves other people’s magic rapidly; he reproduces Tione’s magic and creates an enhanced grimoire for it within a day. 726

Seventy-Two Pillars of Demons

Bai Yue can recruit and transform others into Demon Gods through Demon God cards.

• Offers cards to prospective recruits, who must pour their own power into the card to complete the process. 130
• Has transformed Xenovia into one of his Demon Gods. 197
• Integrates the Seventy-Two Pillars cards into Ophis as part of their contract. 201
• Avoids converting descendants of existing Pillars without consent, as the stored power within their bloodlines could activate a summoning array and alert others. 101

Divine Authority and Noble Phantasms

Bai Yue obtains, studies, and weaponizes Divine Authorities rather than relying on a single power source.

• Golden Sword — Veleslana’s tenth incarnation; severs Divine Power and becomes more effective with greater knowledge of the target. 266
• Pale Rider — Accesses its abilities directly after assuming its role; can grant Divine Authority under specific conditions. 240
• Netherworld — A Noble Phantasm connected to the Underworld; devours surrounding Gods and can disperse the Underworld’s spaces. 332
• Ring of Usurpation — Used in his effort to usurp the Underworld’s Authority. 326

Regeneration and Altered Physiology

Bai Yue possesses extreme recovery capabilities, though his body is not free from limitations.

• Demonstrates regeneration by injuring and reviving himself in front of Aoi Kanzaki. 428
• Rapidly heals severe combat wounds, including an arm twisted during a clash with an assassin. 711
• His blood may suppress Oni and causes unusual reactions in Nichirin ore. 435
• His DNA is “locked”; direct contact with it can cause another Oni’s blood to reconfigure and reinitialize. 415
• A curse can rust his body, reduce mobility, and leave him dependent on healing medicine to sustain combat output. 706 711 720

Eighteen-Wing Mark

Bai Yue’s unique Mark manifests as eighteen wings across his back.

• Enhances physical ability and senses when activated. 441
• Resonates with other Marks and may assist their activation. 441 453
• His understanding of Marks leads the Demon Slayer Corps to believe he may know how to control their effects and prevent their shortened lifespan. 427

Combat Skill

Bai Yue combines unusual powers with deliberate close-quarters tactics.

• Uses Blood Breathing to poison Gyutaro through both direct attacks and the demon’s own bleeding. 439
• Deliberately places himself in dangerous situations to force allies or opponents to confront their fears and fight at full strength. 430 718
• Defeats an LV.5 assassin despite sustaining major injuries. 711
• Can inspire his “chess pieces” to resist magical conversion and self-destruct rather than betray his side. 383

Equipment / Weapons / Items

• Demon God cards — Used to recruit and transform individuals into members of the Seventy-Two Pillars. 130 201
• Ring of Usurpation — Taken from Pandora for studying and usurping the Underworld’s Authority. 326
• Golden Sword — The Authority of Veleslana’s tenth incarnation. 266
• Netherworld — His Underworld-related Noble Phantasm. 332
• Nichirin greatsword — Bai Yue commissions a double-edged greatsword rather than a standard single-edged Nichirin Blade. 436
• High-grade healing medicine — Used repeatedly to compensate for his rapidly depleted stamina and bodily weakness. 711

Relationships

• Aisha — Early companion who witnesses Bai Yue’s power against demons and sees him as someone strict yet gentle whom she can rely upon. 89 92
• Yasaka — Potential Seventy-Two Pillars recruit; Bai Yue offers her a Demon God card while claiming he will not force her decision. 130
• Gabriel — Angel concerned with Bai Yue’s place in the Heavenly Realm; he works alongside her on the realm’s inherited systems. 195 196
• Ophis — Infinite Dragon God whom Bai Yue lures from the dimensional rift and binds by contract through the Seventy-Two Pillars cards. 201
• Athena — Disobedient Goddess defeated after Bai Yue seals her Divine Sparks; their hostility later shifts into a tense, teasing rivalry. 266 275
• Grayfia — Silver-haired maid and trusted safeguard candidate whom Bai Yue intends to empower through the Dragon Eater’s inherited abilities. 318
• Erica — Identified as Bai Yue’s main wife. 317
• Amane — Bai Yue’s wife and mother of his children; later develops incomplete precognition through her Mark. 460 453 454
• Hestia — Goddess whose Familia Bai Yue joins in Orario; she knows his Grace cannot truly be bestowed through normal means. 698 700
• Ais Wallenstein — Sparring partner and ally who carries Bai Yue back to the Guild when his curse worsens; Bai Yue later pushes her toward life-or-death determination. 718 720
• Ryuu Lion — Guard and adventuring companion who becomes suspicious of Bai Yue after witnessing his regeneration, combat ability, and unusual influence on Dungeon monsters. 711
• Liliruca Arde — Recruited from the Soma Familia after Bai Yue and Hestia confront Soma’s captain. 721

Story Role / Major Arcs

• Supernatural World arc — Protects Aisha, confronts demons and church fighters, and begins building the Seventy-Two Pillars of Demons. 89 92 130
• Heavenly Realm arc — Investigates the previous God of the Bible’s core system, angel-rebirth program, and Divine Artifact System. 195 196
• God-killer and Fate arc — Hunts Divine Authorities, defeats Athena, investigates the Underworld, and obtains Fate after dismantling the Fate Domain’s structure. 256 266 326 332 334
• Disboard arc — Arrives in Akihabara, investigates an anomaly within the Ten Pledges world, and is identified as the first Divine Species, the God of Suspicion. 379 386 395
• Demon Slayer arc — Develops and activates his eighteen-wing Mark, researches Oni blood with Tamayo, and fights Upper Rank demon Gyutaro. 415 426 439 441
• Little Garden arc — Navigates Community politics, aligns White Night with his side, and pursues power sufficient to reach four-digit strength. 490 500 607
• Holy Grail War arc — Intervenes in the Eizenbern family’s plans, guides Irisviel and Illya, and descends as a Sword-class Heroic Spirit. 518 527 528
• Orario arc — Joins the Hestia Familia, becomes associated with unexplained accidental deaths, recruits Liliruca, and exposes unusual compatibility with the Falna status system. 695 700 707 721

Notable Quotes

“What's most important is who you believe yourself to be, and I believe myself to be human.” 503

“Rather than saying I'm standing with White Night, it's more accurate to say White Night has been pulled to stand on my side.” 490

Trivia

• Bai Yue considers curiosity one of his defining weaknesses and repeatedly seeks out unfamiliar worlds despite already ruling over stable worlds of his own. 235
• He considers the possibility of becoming omniscient and omnipotent both desirable and dangerous, fearing it could erase his emotions. 334
• His Falna status is abnormal: Hestia can display his abilities as data, but cannot actually grant him a normal divine Grace. 698