King of the Underworld

Biodata

Title and Identity

• Chosen form of address: When Chongli asks how to address the newly created clone, he answers, “You may call me the King of the Underworld!” 118
• Not initially proof of Underworld sovereignty: The clone remains in the living world to govern the Wolf Tribe. It is Mingye’s original body that enters the Underworld to conquer it 118.
• Earlier related claim: Mingye previously questioned whether the being remembered as the “Lord of the Underworld” was truly its sovereign. He suspected it was merely a contender or impostor; this remained his conjecture 45.
• Actual sovereignty: By the finale, Mingye’s original body has become Lord of the Underworld and gained complete control over it, while the clone called King of the Underworld rules the human realm and Demon World 142.

Power Progression

Background / History

Creation and Rule of the Demon World

After discovering that the spirits of the Demon Wolf ancestors had been destroyed by the Underworld, Mingye opened a Netherworld Path and prepared to confront its inhabitants. Because he did not know when he would return, he created an independent clone and entrusted the Wolf Tribe to it. The clone adopted the title King of the Underworld immediately after the original departed 118.

The clone ordered the Five Demon Wolves to lead their armies into the Eastern Country and claim its resources. He subsequently crushed the White Tiger Legion and gravely wounded the Snow Emperor, though Guigu’s prepared teleportation formation allowed them to escape. After a fierce battle with Emperor Yu, he secured an agreement allowing the Wolf Tribe to take Southern Country resources while leaving the Phoenix Tribe alone. These victories established the tribe’s rule over all four great demon countries 120 122.

Search for Eternal Life

Following Izayoi’s death and the departures of Inuyasha and Kōga, the King turned from territorial conquest toward eternal life. He refused to accept that, after defeating his enemies, he would eventually lose to old age 121 122.

His search brought him to Horai Immortal Island. He seized Sōki’s Jade Casket, destroyed her spirit after taking offense at her request to spare the villagers, and discovered Penglai Immortal inside the Roaring Furnace. He then had Chongli carry the furnace away and defeated the restored, fused Four War Gods with a single slash 128 129 130 131.

At Demon Wolf Castle, he assembled leading smiths to investigate the furnace’s flaws and spent a month questioning Penglai Immortal. Learning that no being had lived beyond twenty thousand years did not end his pursuit. He next set out to seek knowledge from the ancient tree yokai Bokusenō 133 134.

War, Death, and Restoration

Reverend Baixin intercepted the King, arguing that his overwhelming power threatened humanity’s future even though he had not harmed humanity. The King killed Baixin and then Miko Qinglian, whose subsequent attack convinced him that further assassination attempts would follow. He returned to Demon Wolf Castle intent on retaliation 134 135 136.

The resulting war brought human masters and rival yokai factions against him at the Western Country–Musashi Province border. Wounded and surrounded, he unleashed Ice Age, freezing thousands upon thousands of miles and extinguishing life across the battlefield. Sesshomaru was deliberately spared, while Blood Eyes escaped after foreseeing the attack 139 140.

The clone’s death alerted Mingye, who returned from the Underworld and revealed its identity to the surviving combatants. After eliminating the four Ancestor Demons, Mingye revived the clone and returned to refining the Underworld’s source power. The King of the Underworld continued governing the human realm and Demon World 141 142.

Appearance

• Clothing: Embroidered, luxurious black robes 121 139.
• Hair and eyes: Black hair and pitch-black eyes 121 140.
• Distinguishing mark: An icy snowflake between his brows 139.
• Weapon: Slay Gods and Demons hangs at his waist 121.
• Resemblance to Mingye: Most Wolf Tribe members fail to notice the substitution. Kyora recognizes Mingye’s face in the clone, describing it as slightly more mature 120 128.

Personality

The King is composed, domineering, and intolerant of perceived challenges to his authority. He destroys Sōki’s spirit after interpreting her plea for the villagers as an attempt to tell him what to do. Hairinbō likewise understands that deceiving him would have severe consequences 129 133.

Toward those under his care, he can be protective and encouraging. He comforts Inuyasha after Izayoi’s death, reassures Kōga when the younger wolf fears losing him, and insists that both youths leave the castle to gain experience. His pursuit of eternal life reflects the same belief: sufficient strength should overcome enemies, hardship, and even time 121 122 133.

Abilities & Skills

Ice Manipulation and Swordsmanship

• Creates thick ice walls to block purifying arrows 139.
• Uses Ice Dragon Blast and Ice Dragon · Ninefold Break · Annihilation during his victory over Sesshomaru 124.
• Channels Slay Gods and Demons’ stored powers, including diamond attacks and manifestations of an ice dragon, White Tiger, and kirin 124 139.
• Exchanges nearly a hundred slashes with Sesshomaru in an instant; their clashes rupture space 124.

One-Sword Style Iaijutsu: Four Realms Freeze

• Draws, strikes, and resheathes his sword before the fused Four War Gods can react 131.
• Freezes elemental attacks together with demon power, world essence, demon blood, thoughts, and the soul 131.
• Defeats the fused Four War Gods and kills Reverend Baixin, shattering the monk’s Golden Body Dharma Form 131 135.

Ice Age

• Releases a freezing wave across thousands upon thousands of miles, freezing attacks and living beings alike 140.
• Costs the clone his life and freezes his own body 140.
• Deliberately flows around Sesshomaru rather than freezing him 140.
• Continues after death. Although the Ancestor Demons shatter the wider frozen domain, the area around the corpse remains intact and protects Sesshomaru 141 142.

Perception and Defensive Power

• Detects Genro beneath the sea and immediately recognizes that his core essence is missing 126 127.
• Enters Genro’s sea mist without being detected 127.
• Senses Penglai Immortal watching him, though he cannot initially pinpoint the concealed spirit 130.
• Uses a barrier to exclude the Roaring Furnace’s refining flames 128.
• Breaks Blood Eyes’ soul-targeting attack through overwhelming will 139.
• Can overpower purifying energy, but combined human attacks still wound him; a gravity formation also briefly slows his movements 135 139 140.

Equipment / Weapons / Items

• Slay Gods and Demons — His principal demon sword. Hairinbō incorporates White Tiger and kirin bones, diamond essence, Ice Wolf powers, evil energy, and the Greater Yokai powers of Fūzetsuga and Kirinmaru into it 121.
• Entei — Flaming demon-horse mount used for travel and aerial movement 123 139.
• Jade Casket — Taken from Sōki; its seal contains the Four War Gods’ source powers, which he releases before defeating their restored form 129 131.
• Refining Furnace / Roaring Furnace — Claimed from Horai Island for the Wolf Tribe. Its long recovery period and inability to strengthen itself prompt him to commission expert smiths to improve it 130 133 134.
• Tessaiga, formerly held in safekeeping — Entrusted to him by Izayoi and returned to Inuyasha before the latter’s departure 122.
• Sōunga and Nether Thunder Blade — Taken into the Underworld by Mingye’s original body, rather than retained by the clone 121.

Relationships

• Mingye — Creator and original body. Entrusts the Wolf Tribe to the clone, senses its death, and later revives it 118 142.
• Chongli — Loyal attendant who learns the clone’s identity at its creation and accompanies it on its travels 118 123.
• Kōga — Regards him as an eldest brother and father-like figure. The King trains him and encourages him to become the Wolf Tribe’s guardian 121.
• Inuyasha — Protected guest and young ward. The King comforts him after Izayoi’s death, returns Tessaiga, and urges him to gain experience outside the castle 121 122.
• Izayoi — Honored guest whose care fulfills Mingye’s promise to Tōga. The King pays his respects after her death 121.
• Sesshomaru — Rival and friend. Loses to the King in their duel, later intervenes against his attackers, and protects the frozen corpse from Blood Demon 124 137 140 142.
• Hairinbō — Subordinate swordsmith entrusted with improving the Refining Furnace and forging the Four War Gods’ bodies into a weapon 133.
• Penglai Immortal — Source of knowledge about the furnace, the world, and longevity 130 133.
• Five Demon Wolves — Commanders responsible for military expansion, castle security, and summoning the realm’s finest smiths 120 123 133.

Notable Quotes

“You may call me the King of the Underworld!” 118

“If we’re strong enough, no enemy can threaten our lives. We can overcome even the merciless passage of time!” 121

“Remember, never let that sword leave your side. And I mean never!” 122