Nezuko Kamado, the younger sister of Tanjiro, possesses an astonishing immunity to sunlight—an ability that even the demon king Muzan doesn’t possess.
Her ability to overcome the sunlight was revealed at the end of the Swordsmith Village arc.
In this article, we will answer the question: How did Muzan find out that Nezuko is immune to Sunlight?
How did Muzan find out that Nezuko is immune to Sunlight?

A significant revelation emerged as the battle between the Tanjiro and Hantengu, one of the Upper Moon demons, reached its climax.
During their intense confrontation, Hantengu, on the brink of defeat, mustered the last remnants of his fading strength to transmit a telepathic message to Muzan Kibutsuji, the demon king.
Within that moment, Hantengu conveyed a shocking truth: Nezuko Kamado, the younger sister of Tanjiro Kamado and a demon herself, possessed a mysterious and shocking immunity to sunlight.
This revelation stunned both the Tanjiro and Muzan, altering the course of their ongoing conflict. Hantengu’s revelation about Nezuko’s immunity to sunlight was a game-changer.
It discarded the long-held assumption that all demons were vulnerable to the sun’s rays, a weakness that the Demon Slayer Corps had exploited in their battle against the forces of darkness.
Nezuko’s newfound ability raised numerous questions and ignited a renewed sense of curiosity and intrigue within Muzan.
For Muzan Kibutsuji, the discovery of Nezuko’s immunity to sunlight held profound implications. It represented a potential breakthrough in his relentless pursuit of power and dominance.
The vulnerability to sunlight had long been a significant limitation for demons, including Muzan himself, who had sought various methods to overcome this weakness.
Muzan has been searching for Blue Spider Lilly for a thousand that is supposed to overcome sunlight for demons.
Nezuko’s unique ability opened up new possibilities, presenting Muzan with the prospect of evolving himself into a much more powerful being.
Hantengu’s revelation not only captured Muzan’s attention but also triggered a dangerous fascination with Nezuko. Recognizing her as an invaluable asset, Muzan became fixated on capturing and consuming her.
He believed that by consuming Nezuko, he could potentially unlock the key to his own invincibility, granting him unparalleled power and the ability to reshape the world to his whims.
The revelation of Nezuko’s immunity to sunlight, conveyed by Hantengu in his final moments, set in motion a chain of events that would have far-reaching consequences.
Hantengu’s revelation brought Nezuko’s unique ability into the spotlight, sparking a race against time as the Demon Slayer Corps sought to protect her while Muzan Kibutsuji relentlessly pursued her to kill and consume her.
The revelation of Nezuko’s immunity to sunlight catalyzed the next phase of the ongoing battle between the Demon Slayer Corps and the forces of darkness.
This revelation is what sets the stage for the final arc of Demon Slayer, The Infinite Castle arc.
It heightened the stakes and deepened the intrigue surrounding the Kamado siblings, thrusting them into the heart of a deadly game with Muzan Kibutsuji.
As the series unfolds, the significance of Hantengu’s revelation will continue to shape the narrative, driving the characters towards their ultimate confrontations and challenging the very foundations of the demon world.
What was Muzan’s reaction after receiving the news from Hantengu?
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Muzan Kibutsuji, the fearsome leader of the demons, was known for his hunger for power and immortality.
Upon receiving the telepathic message from the dying Hantengu about Nezuko’s immunity to sunlight, Muzan’s reaction was a mix of astonishment, intrigue, and sheer delight.
For centuries, Muzan had been obsessed with overcoming the demons’ vulnerability to sunlight, which had been a constant threat to their existence.
The revelation that Nezuko, a demon like himself, could withstand the sun’s lethal rays was a shocking discovery for Muzan.
The news presented Muzan with a prospect—a potential solution to his lifelong pursuit of invulnerability to sunlight.
With Nezuko’s immunity, he saw a glimmer of hope that he could attain the ultimate power he desired, solving the limitations that plagued his kind.
Muzan’s reaction was not only driven by his ambitions but also by the fear of the Demon Slayer Corps.
The Demon Slayers, armed with the knowledge of demons’ vulnerability to sunlight, had proven to be formidable adversaries in his quest for dominance.
Nezuko’s newfound ability threatened to upset the balance of power, making her a significant asset in Muzan’s eyes.
As the series progresses, Muzan’s relentless pursuit of power and his eagerness to exploit Nezuko’s unique ability will undoubtedly shape the future conflicts and encounters between the Demon Slayer Corps and the forces of darkness.
The revelation of Nezuko’s immunity to sunlight has set in motion a dangerous game of cat and mouse, with Muzan determined to harness her power and solidify his reign of terror.
Conclusion
Nezuko’s newfound immunity to sunlight, discovered and shared by the defeated Hantengu, adds an intriguing layer to the complex world of Demon Slayer.
As Muzan Kibutsuji becomes aware of this unprecedented trait, the balance of power and the dynamics of the ongoing conflict shift dramatically.
The revelation sets the stage for future developments and raises questions about Nezuko’s role in the fight against Muzan’s tyranny.
As the series continues to unfold, the implications of Nezuko’s sunlight immunity will undoubtedly shape the course of the Demon Slayer Corps’ battle against the demons.