Kain

Kain is an ancient Hero, the first explorer to enter Beyond, and a wielder of multiple gods' powers. After losing his world and spending centuries isolated by guilt and helplessness, he joins Revival, helps save Hwaya, wounds the Demon Lord, and shelters the guild from Sherafina's final seizure of the dungeon. (Chapters 269, 288–300, and 345–352)

Biography

Guardians and World Enemies

Kain is first known through the history of another world: he once led an invading force against Edias and fought its Hero to a standstill before retreating. His own world had already fallen, leaving him its last survivor and carrying its power after he abandoned the people he could not save. He subsequently shut himself inside Beyond's Residential Area for centuries, despite remaining the dungeon's strongest explorer. By his account, grief over his lost world and beloved eventually gives way to a deeper conviction that he is powerless and has no right to live, so he waits for a death that his immense mana continually postpones. (Chapters 269 and 288–289)

When Hwaya is trapped with the Fear King, Shin and Loretta ask Kain to break the sealed Event Dungeon. He first refuses because nothing he wants can be restored, but Loretta confronts him over accepting the dungeon's help while withholding his strength from other doomed worlds. Shin then offers proof that helplessness need not determine a Hero's future, and Kain agrees to test Revival's potential. He combines Gungnir and Sleipnir to open the king's gate and carry Shin inside, formally joins the guild afterward, and initially keeps an emotional distance while honoring their mutual contract. Later conversation and shared drink show that distance beginning to soften into practical trust. (Chapters 288–293 and 299–300)

Final Wave and the Dungeon's End

Kain resumes challenging the First Dungeon's ninety-second floor after a long period of stagnation, then answers Revival's summons as the final crisis develops. His memories of human-monster chimeras from his ruined world give the guild concrete warning about what uncontrolled land transference can do. His mere presence on Earth also constrains the Demon Lord's planning: Shin concludes that the enemy uses a limited-entry dungeon because he does not want to face both Heroes together. Kain accepts standby duty without argument, indicating that his alliance has progressed beyond the narrowly defined first favor for which he joined. (Chapters 309, 328, 335, and 342)

In the final battle, Kain rides Sleipnir and uses a divine spear to sever the Demon Lord's arm, permanently disrupting it at the cost of further divine power for that engagement. When Sherafina begins drawing the Heroes' world powers into Shin, Kain recognizes the transfer, urges immediate action, and executes their prepared contingency. His newly acquired Kuneē hides every Revival member except Shin inside a personal space Sherafina cannot invade until the dungeon is defeated. Kain survives, dismisses the concealment at Shin's signal, and receives his world's power back, ending the corpus as an active ally rather than the self-condemned recluse Shin first met. (Chapters 345, 347, and 352)

Appearance and personality

Kain is pale, slender, and exceptionally beautiful, with a long neck and features delicate enough that Shin compares him favorably even with famously pretty men. Centuries without cutting his hair leave it longer than an average woman's, and he wears a single layer of translucent, multicolored silk. After joining Revival, he cuts the accumulated hair to slightly above his waist and uses the severed length to form a temporary spear. His appearance remains elegant, but the mana surrounding him gives him the bearing of a dominating emperor rather than physical frailty. (Chapters 288–290)

Reserved, proud, dryly humorous, and burdened by survivor's guilt, Kain initially treats isolation as punishment for fleeing his world's destruction. He can be cutting and deliberately distant, yet his refusal to help is rooted in despair rather than indifference to suffering. Shin's challenge restores a reason to act, after which Kain keeps agreements precisely, offers useful warnings from painful experience, and gradually permits camaraderie. His relationship with Loretta remains emotionally complicated: he calls her a former teacher and kind shopkeeper rather than claiming a romance, while Shin suspects lingering feelings that the corpus does not confirm from Kain directly. (Chapters 288–300, 335, and 347–352)

Powers and abilities

Kain's strength comes from a Hero's world power, centuries of accumulated mana, exceptionally advanced dungeon progress, personal magic, and true-name powers associated with Odin and Hades. He is already Beyond's first and highest prior explorer when Shin meets him, but his long withdrawal leaves some dungeon progress stalled. His abilities are consequently immense without being unlimited: the strongest divine attacks consume access to further divine power, and his final concealment is a prepared answer to Sherafina rather than a universal defense shown against every threat. (Chapters 288–290, 299, 309, and 345–352)

Hero's power and mana

As the last survivor of his world, Kain carries its power and an enormous mana reserve that makes ordinary death remote even after centuries of inactivity. Mana stored in his uncut hair is sufficient to turn the severed strands into a metallic one-use spear, and he can project a presence strong enough to make his arrival over Revival's guild house immediately apparent. Sherafina temporarily draws his world power toward Shin during the final transfer, but Shin later separates and returns it. The corpus does not name Kain's world or define a complete list of authorities granted by its power. (Chapters 289–290, 342, 347, and 352)

Gungnir and Sleipnir

Kain invokes Odin's power through Gungnir, a divine spear described as always striking its designated target. In his first use with Revival, he descends the power onto a spear made from his mana-saturated hair and shoots it through the otherwise sealed Fear King's gate. Gungnir can open the breach, but cannot carry an intruder through alone; Kain summons the eight-legged Sleipnir, whose instantaneous movement and connection to the spear hold the hole open long enough to take one rider inside. The limitation to one entrant and the temporary spear's one-use construction make the rescue a precise deployment rather than a repeatable mass transport. (Chapters 288–290)

Sleipnir can persist inside the hostile space, attack the king at extreme speed, and later return to Kain. In the Demon Lord battle, Kain again rides the steed and throws a divine spear that severs the enemy's arm and interferes with its recovery. He states that the strike prevents him from using further divine power in exchange for its effect, establishing a significant cost even though the text does not give a standard cooldown. Gungnir and Sleipnir therefore provide target-locked penetration, movement, and concentrated injury, but Kain chooses their timing around the loss of subsequent divine options. (Chapters 290, 293, and 345)

Kuneē

Kuneē is the golden helmet of Hades, a god's power Kain deliberately obtains for the plan against Sherafina. When invoked, it extends concealment over the assembled members of Revival and creates a personal space that Sherafina cannot invade or perceive through. This prevents her from dragging the guild into the dungeon while Shin confronts her alone. Kain sustains the effect through that confrontation and deactivates it only when Shin returns and signals success. Its demonstrated application is exceptional group concealment from a divine observer; the corpus does not establish its range outside the assembled force or how often Kain can invoke it. (Chapters 347 and 352)

Personal magic and combat skill

Kain uses spatial magic to maintain an external storage space without relying on the dungeon's inventory and can sit or move in the air. He also controls aura and spear techniques at a level appropriate to a centuries-old Hero, forming and wielding a mana-hardened weapon from hair before applying divine authority to it. His direct strike materially wounds the Demon Lord, but the final victory still depends on Shin, Licorice, and other combined attacks. By the ending he remains combat-capable and has his world power restored, although no post-restoration duel defines a new ceiling for his personal magic. (Chapters 289–290, 293, 299, 345–347, and 352)

Power progression

Relationships

• Kang Shin: Kain's guild master and the Hero who convinces him that action remains possible after failure. Their relationship begins as a conditional exchange, develops into trust and banter, and culminates in Kain protecting Revival while Shin defeats Sherafina and returns Kain's world power. (Chapters 288–300 and 342–352)
• Loretta: Kain's former teacher and shopkeeper, whose disappointment carries enough weight to draw him out of isolation. Kain says she taught him many things and denies a current claim on her, although Shin suspects that Kain retains feelings the text never directly confirms. (Chapters 288–300 and 352)
• Hwaya Eleni Mastiford: The Revival member whose imprisonment prompts Shin to seek Kain. Kain's Gungnir and Sleipnir make her rescue possible, turning his first intervention after centuries of withdrawal into a concrete life saved. (Chapters 288–293)
• Sikatra: Loretta's student and an acquaintance from Kain's earlier dungeon life. Her greeting helps connect his secluded present to the administrative guild community he had abandoned. (Chapters 288–289)

Items

Kain has no separately cataloged personal item. His first Gungnir vessel is a temporary spear made from centuries of cut hair and mana, while Sleipnir and Kuneē are manifestations of gods' powers rather than ordinary equipment with independent item articles. (Chapters 289–290 and 345–352)