Kallen

Biodata

Background / History

Kallen was a Kaslana Family saintess who met the isolated young Otto Apocalypse after finding him wounded near the castle walls. Rather than ridicule his inventions, she took interest in his mechanical creations and encouraged him to use his talents to “save the world” with her. Their families later arranged their engagement, though Kallen treated Otto primarily as a dependable companion and supporter. 556 560 562 566 612

A later memory shows Kallen at approximately fifteen or sixteen in a sunlit Vienna courtyard, enthusiastically reading a knight novel. She invites Otto to share the story, praising the romance of a knight overcoming trials to save a princess, while he teases her about her taste in familiar happy endings. 715

The memory continues with Kallen explaining that the knight and princess each protect something precious: the knight protects the princess, while the princess protects the kingdom. She wishes Otto could become a knight who protects others. When he replies that he only wants to protect her, Kallen smiles and says she will wait for him to do so. 716

Kallen's father died covering his comrades' retreat, leaving her deeply grieved. Otto subsequently used Void Archives to imitate Black Abyss White Flower in an attempt to resurrect him. Kallen stopped the attempt, slapped Otto, and rejected the use of forbidden power to disturb her father's rest or turn him into an artificial substitute. She regarded accepting his sacrifice and honoring his convictions as more important than denying his death. 558 559 560

During a Honkai-induced outbreak of the Black Death, Kallen worked at a relief shelter until she approached physical and mental collapse. Her healing could treat ordinary wounds and exhaustion, but it could not halt the plague. She refused an elderly patient's plea to flee and continued searching for a way to save the dying. Watching her blame herself for her limitations, Otto resolved to obtain the power needed to fulfill her wish to save everyone. 562

As Schicksal's strongest Valkyrie, Kallen fought Collapse Beasts while prioritizing civilian lives. She wielded paired cross-shaped firearms with exceptional speed and precision, destroying beast cores while evacuating survivors. Her decision to protect people Schicksal dismissed as “lowborn” led the bishops to accuse her of rebellion and condemn her to execution. 543

When a colossal Collapse Beast attacked her execution site, Kallen broke her chains by force and fought despite already being wounded and unarmed. She killed the beast with a broken lance, but its final attack mortally wounded her; Otto caught her as she fell. 544 548

During Schicksal's eastern campaign, Kallen was deployed against Immortal Chi Yuan with the Oath of Judah. Chi Yuan stopped the Divine Key's sealing power with one finger, repelled it with a flick, and left Kallen severely injured and unable to continue fighting. 581 582

After Otto placed himself between Chi Yuan and the unconscious Kallen, Chi Yuan spared him and healed Kallen. She distinguished her judgment of Schicksal's sins from the devotion of Kallen's protector. In the aftermath of the campaign, Kallen aided survivors in a ruined village, with the narration describing a growing desire for atonement. During Schicksal's withdrawal, she rescued a surviving orphan and persuaded Otto to bring the child, named Vera, back to Europe with them. 574 575

Kallen later witnessed Schicksal's exploitation of civilians and openly intervened when a knight attempted to beat a little girl. Refusing to launch a war, she became the Phantom Thief Kallen: she stole only wealth extorted from the public and distributed food and money to impoverished families. 588 589

Otto secretly supplied the intelligence, escape routes, diversions, and public-opinion guidance behind her successes. During one operation, he destroyed his own laboratory to draw pursuing knights away; during another, he disguised himself as Lady Green Lily to distract nobles at the Duke of Florence's estate. Kallen did not know the full extent of these interventions. The observers distinguish her genuine commitment to justice from Otto's exploitation of her reputation and kindness to advance his schemes. 579 580 582 583

Her investigations led her to Schicksal's Black Box laboratory, where she uncovered human experimentation and Honkai research. Captured by Eleanor Schariac, Kallen was imprisoned and later released under circumstances she did not understand. She returned with the Oath of Judah to confront the organization’s experiments, then publicly revealed Schicksal's records and was declared a traitor. 594 596 599

Her first laboratory infiltration failed because she entered without weapons and was weakened by its unusual energy. Eleanor defeated her and confined her in the Prison of Stillness. Several days later, Kallen was released for “insufficient evidence,” and the records of her intrusion were erased. Otto visited her in prison and offered reassurance while privately treating her suffering as a means of intensifying her resistance and furthering his plans. 583 585

While fleeing Schicksal with the Black Box containing the Herrscher of Corrosion's consciousness, Kallen leapt from a cliff rather than allow the relic to be seized. She survived, washed ashore in the Far East, and was rescued by Yae Sakura. 603 604

At Yae Shrine, Kallen was initially feverish and too weak to swallow medicine. Sakura administered it mouth-to-mouth to keep her alive. As Kallen recovered, they shared meals, gathered herbs, and watched the stars together, developing affection through their time in one another's company. 593 594 596

After the Herrscher of Corrosion possessed Sakura and devastated the Yae village, Kallen sought to save her rather than kill her. She used the Oath of Judah's chains to seal Sakura, feeding the Divine Key with her own life force when its ordinary power proved insufficient. Kallen then surrendered to Schicksal in exchange for Sakura's safety and accepted a death sentence. 609 610 611 612

Before attempting the seal, Kallen sought Otto's knowledge of ancient weapons, insisting that she needed a method that would suppress Sakura's power without killing her. During the confrontation, she appealed to Sakura's promise that they would travel the world together; Sakura briefly recognized her before the corrupting power surged again. 599

Schicksal specified that Kallen would be hanged in its headquarters' central plaza three days after sentencing. Castle Council nobles sought to use her conviction to undermine the Kaslana Family's standing, but Otto intervened as her nominal fiancé and then privately begged his father, Bishop Nicholas Apocalypse, to save her. Sakura, meanwhile, awakened within Judah's seal and resolved to rescue Kallen. 601

Nicholas offered to commute Kallen's death sentence to life imprisonment if she fulfilled the marriage contract. Kallen refused, regarding the bargain as an abandonment of her beliefs and an acceptance of the authority she had opposed. She openly acknowledged loving the person the world considered a “monster,” but insisted that this love strengthened rather than displaced her commitment to protecting what remained worthwhile in the world. 602

Otto subsequently released Collapse Beasts to disrupt the execution and rescued Kallen from the gallows. Rather than welcome survival at that price, she confronted him over the civilians killed by his actions. She returned to protect those threatened by the beast tide, shielding an orphan girl with her body and refusing to evade a fatal attack that would have exposed the child. Otto reached her too late to save her. 604 606 607

The final memory fragment also shows Kallen praying in a ruined church, distressed that her survival had cost innocent lives and afraid that her death would drive Otto to further atrocities. When Otto found her, she condemned his actions despite his confession of love. She gave him her silver cross, asked him to live well, find happiness, and forget her, then left to face the danger outside. The cross remained with Otto after her death. 606 609

Otto's Attempt to Change Her Fate

Kallen's death became the central motivation behind Otto's five-hundred-year pursuit of resurrection. His experiments, manipulation of the Kaslana bloodline, and cultivation of Kiana were directed toward obtaining a living “key” capable of reaching the World Line he desired. Kiana's humanity and emotional attachments were essential to this scheme, rather than qualities he intended to eliminate from the outset. 539 647 649

After connecting himself to the Imaginary Tree as a False God, Otto sought to alter the record of Kallen's death. He openly acknowledged that she would oppose the suffering caused by his plans, but maintained that her existence mattered more to him than her approval. His preparations included a contingency that would sacrifice five hundred years of civilization for her return. 669 675 676 679

The eventual objective is described not as restoring Kallen to the ruined world Otto had left behind, but as forcing a new branch from the Imaginary Tree. The original world's history and suffering would remain unchanged, while the new World Line would give Kallen a life continuing from five hundred years earlier. At this stage, her survival was still the outcome Otto sought rather than a confirmed, stable result. 695

An initial depiction showed Kallen alive in a newly formed world, but the subsequent readout revealed that convergence still required her death. The observers explained that Otto had delayed the outcome rather than permanently overturned it. The Tree's later records continued to report historical instability, preventing these early appearances of survival from establishing a final resolution. 696 697 699 700

The Tree's subsequent readout classified Kallen's cause of death as “force majeure” and reported continuing historical instability. The execution day then appeared alongside Otto's struggle within the Tree; Tang San explained that the scenes were unfolding simultaneously rather than depicting ordinary time reversal. Spacetime disturbances from Otto's battle triggered a Honkai outbreak at the execution grounds. 699 705 714

In this depiction, Kallen broke her steel shackles, tore away the noose, and abandoned her opportunity to escape. With Judah confiscated, she fought bare-handed, rescued an elderly woman, and saved more than a dozen civilians despite increasingly severe injuries. She finally shielded a little girl from a beast's fatal spike and held its claw to give the child time to escape. She died from the wound and blood loss while still trying to comfort the girl. 714 715

Otto witnessed her death through the Imaginary Tree and renewed his determination to change it even at the cost of his own existence. As his body and consciousness approached dissolution, his memories returned to their youthful conversation in the Vienna courtyard. 715

Recalling his promise to protect her, Otto accepted the price that “Otto Apocalypse never existed” and sent his light toward the execution grounds five hundred years earlier. His meteor froze the surrounding spacetime and overwrote the instant of Kallen's injury: the Collapse Beast's claw now missed instead of piercing her, and the wound and blood disappeared. 716 725

Survival in the New World Line

With the fatal injury erased, Kallen retained the strength to counterattack. In the corrected scene, she wielded the Oath of Judah, drove its golden chains through the Collapse Beast's skull, and pinned it dead to the ground. She briefly remembered the sensation of being pierced, but dismissed it as her imagination after finding her abdomen uninjured. She picked up the little girl and escaped the execution grounds without knowing who had intervened. 725

The correction also removed the surrounding threats to civilians. The Light Screen then showed Kallen continuing her career among the Schicksal Knights, saving more people and preventing further Honkai disasters over the following years. Her survival produced wider changes as those she rescued went on to affect other lives. The Tree explicitly confirmed that the new World Line, “Kallen Kaslana Survives,” had fully stabilized and that her previously destined death no longer existed. This superseded the earlier readouts in which convergence still demanded her death. 727

The alteration did not eliminate its cost. Otto's remaining golden power repaired spacetime fractures caused by the rewritten history, and he ultimately removed himself from time so that echoes of the old World Line could not threaten Kallen's new life. He saw her alive among flowers, carrying a knight's lance, but she could not see him. When he tried to reach her, she caught only a fading speck of light, sensed something behind her, and continued forward without looking back. 725 730

The final record described Otto's success as giving Kallen happiness that would forever have nothing to do with him. A subsequent childhood illusion revisited her trust in his model airplane and their pinky promise that he would remain with her for a long time. Its accompanying record classified the promise as partially fulfilled: Otto had accompanied Kallen throughout her life, but not under an identity she knew. The scene does not establish a reunion in which the surviving Kallen recognizes him. 736 737

Appearance

Kallen is a silver-white-haired maiden with emerald-green eyes in her earlier depictions. Her appearance changes with her role, from a frontline Valkyrie in knightly armor to a masked outlaw operating at night. 543 589

• Wears simple but sturdy knight armor while fighting Collapse Beasts. 543
• Uses a fitted black night suit and silver half-mask as the Phantom Thief. 589
• Wears a white nun's habit during her efforts to aid impoverished communities. 566 588
• Her hair becomes stained red with blood during her final battle at the execution grounds. 544
• Her childhood training attire includes a wooden sword carried on her back. 548
• Later depictions describe her eyes as blue, both at the execution grounds and in the memory of her teenage years. 714 715
• At the execution platform, her white prison clothes are stained with blood and grime, and her face already bears wounds before the outbreak begins. 714
• One youthful depiction shows her silver hair in twin ponytails, with dust from battle on her face and a shallow cut on her arm. 554
• Following the historical correction, her abdomen and clothing show no wound, bloodstain, or tear from the attack that originally killed her. 725 727
• In the new World Line, she appears among blooming flowers with a knight's lance, displaying the vitality of her renewed life rather than the sorrow of the execution grounds. 730

Personality

Kallen's defining trait is an instinctive need to protect others. Even after Schicksal betrayed her and sentenced her to death, she immediately fought to save the same civilians and knights who had watched her execution. 544 548

She is compassionate but not passive. Kallen openly condemns knights who abuse civilians, rejects Schicksal's human experimentation, and chooses targeted, non-lethal theft over indiscriminate rebellion. 588 589 596

Her idealism is paired with resolve: she refuses Otto's attempt to use forbidden resurrection to restore her father, risks her life to seal Sakura rather than destroy her, and accepts responsibility for Sakura's safety even when it costs her freedom and life. 570 610 611

Kallen does not regard her own survival as justification for sacrificing innocent people. Her horror at Otto's release of the Collapse Beasts exposes the divide between his desire to preserve her life and her commitment to protecting others. Even as she dies, she directs her remaining attention toward reassuring the child she saved. 604 607 715

Her younger self displays an openly romantic and enthusiastic side, delighting in knight stories and their hopeful endings. Her appreciation of Otto's inventions likewise reflects curiosity and an ability to recognize worth in someone others dismissed. 549 551 715

Kallen places fidelity to her convictions above survival or political compromise. She refuses the marriage bargain offered to avert her execution and explicitly states that loving Sakura is a reason to uphold her beliefs more firmly, not abandon them. Her understanding of heroism centers on protection: different people may protect different things, but their willingness to act for what is precious gives their efforts meaning. 602 716

Her compassion also makes her vulnerable to guilt over suffering she cannot prevent. During the plague she exhausts herself trying to heal victims, and after Otto's rescue she struggles with the knowledge that innocent people died for her. Nevertheless, both situations lead her to continue seeking a way to protect others rather than simply withdraw. 562 606

Abilities & Skills

Valkyrie Combat

Kallen was identified as Schicksal's strongest Valkyrie in five hundred years and later held S-rank status. 543 612

• Rapidly destroys Collapse Beast cores with paired cross-shaped firearms. 543
• Combines evasive movement, close combat, and battlefield awareness to protect civilians during active attacks. 543 544
• Can break execution chains through brute force. 544 548
• Killed a colossal Collapse Beast by driving a broken knight's lance through its eye socket after exhausting her strength. 544
• Was decisively outmatched by Immortal Chi Yuan, whose strength nullified the Oath of Judah and left Kallen unable to hold the weapon. 582
• Can fight Collapse Beasts without weapons, sending one flying with a punch and shattering another with a knee strike. 714
• Continues fighting through extensive blood loss and deep wounds while carrying civilians to safety. This endurance does not prevent fatal injury or death from blood loss. 714 715
• In the corrected execution-ground battle, immediately counterattacks with Judah once her fatal injury has been erased. Her victory results from restored opportunity and strength, not a newly acquired transformation. 725

Oath of Judah

The Eleventh Divine Key, Oath of Judah, is a cross-shaped weapon designed to restrain Honkai-related powers. 596 610

• Releases innumerable golden chains marked with restraining and purifying runes. 581 610
• Can seal Herrscher-level power and imprison time and space. 581
• Successfully sealed Yae Sakura's Herrscher form after Kallen reinforced it with her own life force. 610 611
• Its standard sealing power could not affect Immortal Chi Yuan. 582
• Its use can severely drain Kallen's life force when she forces it beyond its normal limit. 610
• Possesses the Authority of Binding and can deploy a barrier that suppresses inhuman power. Kallen activates its chains through hand seals and an ancient prayer during her attempt to save Sakura. 599
• Its chains can also inflict direct physical damage: in the corrected history, they pierce a Collapse Beast's skull and pin it to the ground. 725

Phantom Thief Operations

Kallen became a non-lethal vigilante after witnessing Schicksal's corruption. 589

• Infiltrates noble estates while evading patrols and security. 589
• Takes only the amount extorted from citizens, then distributes food and money to the poor. 589
• Leaves cards signed “Phantom Thief Kallen” at robbery sites. 589
• Her operations relied heavily on Otto's intelligence, route planning, escape support, and diversions. 590 591
• Her initial failure in the Black Box laboratory demonstrates her vulnerability when unarmed and exposed to unfamiliar suppressive energy. 583

Healing and Protective Faith

Kallen possesses limited healing abilities expressed through holy light and the power of faith. These support her relief work but do not make her capable of saving every patient. 562

• Can heal injuries caused by ordinary blades and swords. 562
• Can soothe soldiers' exhaustion. 562
• Can use the power of faith to drive away Collapse Beasts within a limited area. 562
• Cannot cure the Honkai-induced Black Death; sustained treatment exhausts her without preventing the deaths of infected patients. 562
• The historical correction that removes her execution-ground wound is Otto's intervention through the Imaginary Tree, not an extension of her own healing power. 725

Power Progression

Equipment / Weapons / Items

• Paired cross-shaped firearms — Used to fire precisely at Collapse Beast cores. 543
• Knight's lance — Used in her battle against the colossal Collapse Beast; a broken lance delivered the killing blow. She also carries a knight's lance when shown alive among flowers in the new World Line. 544 730
• Oath of Judah — Eleventh Divine Key; a chain-and-cross weapon for binding and suppressing inhuman power. Schicksal confiscated it before the execution-ground battle depicted during Otto's struggle within the Imaginary Tree. In the corrected history, Kallen has the weapon and uses it to kill the beast whose attack originally proved fatal. 596 610 714 725
• Sixth-Generation Sacred Vestment: Confession — A reinforced white nun's habit made by Otto; its life-alchemy formation absorbs ambient life energy to slowly heal injuries. 566
• Silver half-mask — The signature mask of Phantom Thief Kallen, gifted by William Shakespeare. 589 591
• Black Box — A container holding the Herrscher of Corrosion's consciousness, which Kallen protected while fleeing Schicksal. 603 604
• Wooden sword — Carried during her childhood training and early encounter with Otto. 545 548
• Knight novels — A favorite form of reading in her youth; she particularly enjoys their romantic adventures and hopeful endings. 715
• Silver cross — A personal cross Kallen clutches while praying in the ruined church. She gives it to Otto before leaving him, and he preserves it as her relic after her death. 606 609

Relationships

• Otto Apocalypse — Childhood friend and nominal fiancé. Kallen inspired Otto to pursue the goal of saving the world, while Otto became her planner and supplier; his obsessive manipulation and pursuit of her resurrection ultimately opposed her ideals. She condemned his release of Collapse Beasts to save her, while he later admitted that he would pursue her return even knowing she would oppose him. His final plan creates a separate World Line in which she survives, rather than a reunion in the original world. He erases himself to secure that life, leaving her unaware of the person responsible for her survival. Later recollections revisit her wish that he protect her and their childhood pinky promise to remain together; the Light Screen describes the latter as only partially fulfilled because his lifelong presence was not under an identity she knew. 562 566 590 612 604 676 695 716 725 727 730 737
• Yae Sakura — The person Kallen calls “the most important person in my life.” Kallen uses the Oath of Judah and her own life force to save Sakura from the Herrscher of Corrosion. Their shared promise to travel the world becomes part of Kallen's appeal to Sakura during the sealing attempt. Sakura later awakens within the seal and resolves to rescue her. Sakura also nurses Kallen back to health at Yae Shrine, administering medicine mouth-to-mouth when she is too weak to swallow. Their shared daily life develops into affection, and Kallen later openly acknowledges loving the woman the world regards as a monster. 604 610 611 599 601 594 596 602
• Vera — An orphan Kallen rescued from ruins; Kallen and Otto brought her to Europe and raised her as their daughter. A later account portrays Vera as Otto's younger-sister figure after his rise to archbishop, with Kallen serving as an admired model for her desire to protect their home. 586 612
• Eleanor Schariac — Schicksal operative and Otto's adoptive sister. She captured Kallen in the Black Box laboratory and later opposed her efforts to stop Schicksal's experiments. 594 596
• Kaslana Family — Kallen is one of its heroes and embodies its inherited ideal of protecting humanity. Her conviction also becomes an opportunity for Schicksal nobles seeking to weaken the family's political standing. 543 601
• Schicksal — Her former organization in the original World Line. Though celebrated as its strongest Valkyrie, she was branded a rebel and traitor for protecting civilians, exposing experiments, and harboring Sakura. The corrected World Line shows her continuing her career among Schicksal's knights after surviving the execution grounds. 543 599 611 727
• Kiana Kaslana — Identified as Kallen's descendant. Otto cultivates Kiana's Herrscher potential and emotional attachments to make her a living bridge toward the World Line where Kallen can exist. 647 649
• Theresa — Possesses Kallen's genes as a result of Otto's efforts to reproduce her; Otto regards her as a flawed replica rather than the resurrection he seeks. 539
• Kallen's father — Died fighting as a hero. Kallen rejects Otto's forbidden attempt to restore him, refusing to accept a method that violates her father's legacy and reduces the dead to an artificial substitute. 560
• William Shakespeare — Gave Kallen the silver half-mask associated with her Phantom Thief identity. 589 591
• The girl at the execution grounds — A child Kallen shields from Collapse Beasts at the cost of her life. Kallen continues comforting her even after receiving a fatal wound. In the corrected history, the fatal blow misses, Kallen kills the beast, and she carries the girl away safely. 607 714 715 725
• Immortal Chi Yuan — Defeated Kallen decisively during Schicksal's eastern campaign, nullifying Judah's sealing power. After Otto intervened to protect the unconscious Kallen, Chi Yuan healed her before departing. 571 574 582
• Nicholas Apocalypse — Otto's father and Schicksal's bishop. He offered a political marriage bargain to commute Kallen's execution to life imprisonment, but she refused to surrender her convictions for survival. 601 602

Notable Quotes

“I'm going to change it. Even if I must stand against the entire world.” 589

“She is the most important person in my life.” 610

“Sakura... live. Live well... in my place.” 611

“Big sister is here. Big sister will protect you.” 618

“I only know that any future built on the sacrifice of innocents deserves to be destroyed!” 585

“Don't be afraid... Big sister... won't let them... hurt you...” 607

“Because stories about knights are the most romantic.” 715

“Life is far less important than one's beliefs.” 602

“Then I'll wait for Otto to come and protect me.” 716

“Otto, you have to stay with me for a long, long time.” 737

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