Boo

Boo is Yeon-woo's first magical Spirit Familiar and the reincarnated continuity of the ancient great mage Faust. He begins as an unnamed witch-doctor spirit, receives identity and growing intelligence when Yeon-woo names him, and develops through necromancy, study, recovered memories, and an Arch Lich transformation. “Boo” and “Faust” are not separate beings: Faust is Boo's past-life identity, whose memories and powers return unevenly before becoming organized within the loyal magician Boo has chosen to be.

Biography

A Named Spirit and the First Lich

Yeon-woo acquires the spirit of a witch doctor and names him Boo, drawing the name from the first sound of the Korean term for the dead man's former role. The act of naming gives the previously instinctive spirit a firmer identity and accelerates his intelligence. Boo soon leads Yeon-woo's familiar unit, filling terrain with fog that dulls the senses and provokes fear while directing other dead from the rear. His first development is therefore social as well as magical: he changes from stored power into a subordinate capable of interpreting orders. (Chapters 82–88)

When Yeon-woo later gives his spirits constructed forms, Boo becomes a Lich and voluntarily confirms absolute service. His old witch-doctor knowledge lets him work with corpses, souls, curses, and mist rather than imitate the swordsmen around him. Death Summons turns sacrificed souls and available remains into skeletons or zombies; Fog of Blood confuses enemies and can drain vitality or magic for allies; Corpse Absorption expands the elemental spells available according to the corpses and souls consumed. These tools establish him as chief magical support, but their dependence on usable dead, soul supply, and his master's resources also leaves room for further growth. (Chapters 128–129)

The Lawless Book and the Return of Faust

Boo pursues that growth through consumption and scholarship. He absorbs ghosts and demonic species, studies the Lawless Book, works with Brahm and Rebecca, and assists Yeon-woo with runes and the Philosopher's Stone. By combining demonic magic, rune research, and accumulated vestiges, he can reconstruct traces of past events and has already exceeded an ordinary Lich. Fragments of another life begin surfacing during this process, suggesting that his rapid comprehension comes not only from new study but from knowledge whose original owner he has forgotten. (Chapters 187–236)

Doctor Doom recognizes the answer and calls him Faust. The former Faust was a great mage who created sword magic, helped found demonic studies with De Roy, made the Philosopher's Stone from the Emerald Tablet and knowledge associated with Mephistopheles, and once possessed power comparable to the Summer Queen. Boo acknowledges the identity but cannot immediately recover its complete memories or authority. The revelation does not introduce a second mind occupying him; it identifies the previous life underlying Boo's instincts, research, and unusual potential, while the name Boo continues to describe the present person who serves Yeon-woo. (Chapters 337–343)

Tartarus and an Old Enemy

In Tartarus, the barrier between present growth and past expertise becomes increasingly permeable. Boo recovers Faust's memories day by day and can open layered magic circles or rain spells across a battlefield with a simple command. When Demonism joins him during the confrontation with Allforone, it temporarily restores the fuller Faust identity, memories, and abilities. Boo/Faust then addresses Allforone as an old enemy, uses a life vessel to return after destruction, and fights with the confidence of a challenger who remembers the conflict that once defined him. (Chapters 367–399)

The restoration is powerful but unstable because Demonism is supplying what Boo cannot yet sustain alone. Once it leaves, the complete Faust identity recedes and much of the recovered memory vanishes, although lesser memories and techniques such as Faust's Evil Circle remain. Boo resumes his familiar role rather than becoming a different character after the possession. His subsequent desire to recover everything Faust lost is thus a search for continuity: he intends to integrate the ancient mage's knowledge into the loyal and increasingly self-directed existence built under Yeon-woo. (Chapters 397–406, 494)

Arch Lich, Pale, and Darkness

During Yeon-woo's prolonged meditation, Boo experiences centuries outside and roughly a thousand years within consciousness. A Skeleton King Tablet catalyzes the dormant Faust identity, and Boo reorganizes the scattered memories rather than merely borrowing them. He emerges as an Arch Lich, first completing the divine position of Defeat and then establishing Pale as one of the four paths of death beside Conquest, War, and Famine. He explicitly keeps a clear line between past and current life, using Faust's accumulated regrets and discoveries as material while kneeling to Yeon-woo as Boo. (Chapters 481–514)

The transformation lets him surpass the peak attributed to his former life. Hundreds of magic circles can deploy fire, ice, summoned dead, and barriers at once; Inferno Sight carries both the Black King's darkness and the terror of Faust's Infernal Eyes; and his understanding of the Emerald Tablet joins order and chaos in a single system. At Tartarus's altar, he absorbs divine egos into a crystal orb and turns cursed fog toward emptiness and darkness, killing a divine enemy by taking its soul. Pale consequently evolves from authority over ordinary death into a law-rejecting presence that observers compare to an Outer God, although Yeon-woo's near-infinite magic remains essential to maintaining his armies and repeated resurrection. (Chapters 511–525, 555–582)

The Black King's Magician and the Latest Search

Boo becomes the magical commander of the Black King's forces. His Inferno Sight spreads barriers that prevent escape and disrupt hostile magic, while his undead legions and Ghost Giants give large-scale form to the knowledge absorbed from the Tower and Emerald Tablet. After Yeon-woo's transition into the Black King's complete main ego, Boo disappears with the other principal familiars and later returns several meters tall, combining order and chaos at a level compared with the Eight Gods of Disorder. His loyalty remains absolute, but it is intelligent loyalty: he judges battlefield needs, coordinates the dead, and responds immediately when his master changes an order. (Chapters 601–612, 641, 696–747)

The side stories preserve that agency. Boo is among the first to recognize that contact with Yeon-woo has failed, and he brings the anomaly to Shanon rather than assuming silence is another command. The broken Channel matters precisely because their bond has survived every earlier change in body, memory, divinity, and world line. By the latest chapters, Boo remains active as an Arch Lich and Black King's magician, using the identity he built after death and the integrated legacy of Faust to help search for the absent master he still chooses to serve. (Chapters 811–812, 856)

Appearance and personality

Boo begins as a witch-doctor spirit whose presence is more readily identified through the fog and magic surrounding him than through an ordinary living body. His Lich evolution gives him a robed skeletal form, a staff, and supernatural light within the hood where living eyes would be. As an Arch Lich he grows from more than two meters to several meters tall, wears tattered robes, carries a crystal orb during major rites, and radiates an aura of death strong enough to overwhelm the surrounding laws. Flames burning in his eye sockets serve as his most consistent visible expression. (Chapters 82–88, 128–129, 511–512, 555–582)

He is quiet, scholarly, patient, and exceptionally loyal. Boo rarely matches Shanon's joking speech, instead expressing attachment through meticulous study, battlefield support, and concern when his Channel fails. His devotion is not a lack of identity: being named begins his intelligence, he chooses continued service after becoming a Lich, distinguishes his present self from his Faust memories, and grows into a commander capable of independent judgment. Even full recovery of the ancient mage's pride and old enmities does not erase the person formed as Boo. (Chapters 82–129, 337–406, 494–525, 745–747, 811–812)

Abilities and powers

Spirit Familiar body, life vessel, and Channel

As a Spirit Familiar, Boo is a dead soul given a functional body through Yeon-woo's death-related artifacts and magic. Naming stabilizes his ego, while construction as a Lich supplies a durable magical form that can live in the master's shadow and communicate through a Channel. His status allows destruction without ordinary biological death: the soul can withdraw or be reconstructed, and at full Faust strength he manifests again through a life vessel after Allforone destroys a projected body. (Chapters 82, 128–129, 397–399)

This resilience is conditional rather than limitless self-resurrection. Early Boo depends on Yeon-woo for manifestation, magic, collected souls, and opportunities to evolve; even the later Arch Lich's repeated returns and vast army are sustained by the master's near-infinite magical supply. Memory also has its own failure state. Demonism can restore Faust temporarily, then take that completeness away when it departs. By the latest corpus Boo has an independently active, integrated identity, but he still maintains a Channel whose unexplained collapse prompts the search for Yeon-woo. (Chapters 128–129, 397–406, 511–525, 582, 811–812)

Necromancy, curses, and undead command

Boo's original witch-doctor system uses souls and corpses as both material and medium. Death Summons sacrifices souls to call an entity for which a compatible corpse is available, producing skeletons, zombies, and later far greater undead. Fog of Blood spends a soul to spread disorientation and fear; under suitable conditions it also takes health or magic from enemies and transfers the benefit to allies. Corpse Absorption converts the qualities and quantity of absorbed remains into elemental capacity, initially allowing basic fire and ice rather than granting unrestricted mastery of every corpse's abilities. (Chapters 88, 128–129)

Scale increases with rank, study, and the energy Yeon-woo can provide. Boo moves from commanding a small familiar squad to armies of dead, Ghost Giants, ghost horses, and repeated Dis Pluto deployments. His cursed fog eventually becomes tied to emptiness and darkness and can take even a divine soul, while Inferno Sight supports battlefield-wide barriers and magical interference. Those effects remain resource-intensive and interact with terrain, corpses, absorbed egos, and the master's domain; they are not evidence that Boo can summon unlimited forces without a magical source or preparation. (Chapters 525, 582, 601–612, 696–747)

Faust's magic, the Emerald Tablet, and Inferno Sight

Faust's legacy supplies the theoretical core behind Boo's mature spellcraft. The Emerald Tablet and knowledge connected to Mephistopheles underlay the former mage's creation of the Philosopher's Stone, while joint demonic studies and sword magic made Faust a founder rather than a specialist in one element. Boo rebuilds that breadth through the Lawless Book, rune work, Brahm and Rebecca's instruction, absorbed Tower knowledge, and recovered memories. He can reconstruct past events from lingering vestiges, layer hundreds of circles, and deploy fire, ice, summons, suppression, or barriers according to the battlefield. (Chapters 187–236, 337–343, 522, 601–612)

Inferno Sight is the sensory and projective focus of that integration. It combines the darkness received through the Black King with the fear associated with Faust's Infernal Eyes, letting Boo perceive and pressure beings that ordinary magic cannot easily affect. Spread through a barrier, it blocks retreat and cancels hostile workings; focused through his Arch Lich body, it helps coordinate simultaneous spells and undead. Its evolution tracks memory recovery: early Boo possesses strong but incomplete techniques, Demonism briefly unlocks the former peak, and the later Arch Lich organizes both lives' knowledge well enough to exceed Faust without relinquishing Boo's allegiance. (Chapters 226, 397–406, 511–525, 601–612)

Arch Lich, Pale, and the union of order and chaos

The Skeleton King Tablet and long internal meditation trigger Boo's promotion to Arch Lich. The form represents the highest position available to an undead mage after death, massively enlarging his body, magical capacity, and authority. He first opens Defeat and then completes Pale, one of the four complementary divine routes through Yeon-woo's death divinity. Pale governs the killing, curse, and soul-taking dimension of that structure, while Shanon's Conquest, Hanryeong's War, and Rebecca's Famine cover other expressions. (Chapters 500–525)

Boo's signature late achievement is joining order and chaos through the Emerald Tablet and identifying their deeper essence with darkness. At Tartarus's altar, his authority rejects ordinary laws, his crystal orb stores absorbed divine egos, and his fog reaches toward emptiness strongly enough to resemble an Outer God's presence. Later observation places his combined state near the Eight Gods of Disorder and records major damage dealt during the war of Night. The comparison signals his latest scale rather than proving equality with every Outer God; his service, Channel, and reliance on Yeon-woo's power remain active constraints on how the authority manifests. (Chapters 555–582, 641, 743–747, 811–812)

Power progression

Relationships

• Yeon-woo: Boo's namer, master, and source of the power sustaining his familiar existence. Their bond develops from command into chosen loyalty, surviving the recovery of Faust's identity and the Black King's transformation; its failure in the side stories is what launches Boo's latest search. (Chapters 82–129, 187–747, 811–856)
• Shanon: The first knight and most vocal member of Yeon-woo's familiar group. Shanon's front-line attacks complement Boo's magical control, and Boo later alerts or joins him when their master's contact disappears. (Chapters 128–253, 367–747, 811–812)
• Hanryeong: A fellow chief familiar whose sword and authority of War operate beside Boo's Pale. Their coordinated domains form part of the Black King's principal combat structure. (Chapters 150–253, 367–747)
• Rebecca: An early magical mentor and later fellow familiar. Her divine and elemental knowledge contributes to Boo's research, while her Famine authority becomes one of the four death paths alongside Pale. (Chapters 182–236, 367–525, 696–747)
• Brahm: A scholar and magician who helps Boo study runes, the Philosopher's Stone, and difficult magical principles. Their later discussions continue even after Boo surpasses Faust's former peak, reflecting a relationship based on inquiry rather than rank alone. (Chapters 187–236, 641)
• Allforone: Faust's old enemy and the opponent whose presence briefly draws the full past identity to the surface. Their clash proves Boo/Faust's continuity but also exposes how unstable the initial restoration is without Demonism. (Chapters 337–343, 395–406)
• Jeong-woo: Yeon-woo's brother and an ally Boo protects within the familiar formation. When Yeon-woo vanishes, Jeong-woo becomes part of the family network through which Boo and Shanon investigate the missing Channel. (Chapters 603–604, 696–700, 811–826)

Items

No qualifying notable item is established for Boo in the supplied corpus.