Demons, specifically Muzan Kibutsuji, want the Blue Spider Lily because it's the key ingredient in the experimental medicine that first turned him into a demon, granting him powers but also a fatal weakness to sunlight; he desperately seeks the flower to find a way to overcome this sun vulnerability, hoping to achieve true immortality and become a perfect being, though ironically, it only blooms in daylight, making it impossible for him and his demons to find, according to this Quora post and Fandom wiki.
This flower has medicinal properties, being used to cure Muzan of an unknown illness that would've caused him to die before turning 20, albeit the medicine was in its experimental stage and thus extremely difficult to replicate.
How Demon Slayer's Muzan Originally Became The First Demon - IMDb. Origin story reveals Muzan's accidental transformation into a demon due to experimental treatment with Blue Spider Lily. Muzan created demons by sharing his blood and seeks Blue Spider Lily to cure his sunlight aversion weakness.
The Blue Spider Lily medicine was also the cause behind Muzan's demonification, granting him a strong body and changing his blood to have transformative properties, enabling Muzan to create more of his kind as well as hold dominion over them.
Spider lilies are native to Asia, particularly Japan and China. In traditional Japanese folklore, blue spider lilies often symbolize death and the transient nature of life. The flower's unique shape, with long, slender petals and a central cup formed by fused stamens, gives it its common name.
Nezuko's immunity to sunlight in Demon Slayer may come from eating the Blue Spider Lily, as shown in the anime's finale. The Blue Spider Lily's significance adds depth to Muzan's failure, highlighting his contempt for humanity in the series.
Hantengu sends Muzan information that Nezuko is able to withstand sunlight, thus making his assault on the Sun Breathing family a success and that he finally created a demon that can withstand as the king of demons plans on getting the girl, then devouring her to gain immunity to sunlight for himself and finally become ...
So according to the canon Demon Slayer Fan book. Tanjiro's mother actually knew the location of the blue spider lily. Also, she took tanjiro there when he was a kid. and this is why tanjiro sees it when his life flashes before his eyes when fighting Rui.
Among them, the Black Nichirin Sword is the rarest and most mysterious, sparking intrigue among fans. The Black Nichirin Sword is wielded by Tanjiro Kamado. Its dark hue is linked to Sun Breathing and immense potential, yet its true nature remains a mystery.
A normal dose of wisteria poison on demons could hinder their abilities like regeneration, movement, suppressing their extrasensory perception as well as weakening their Blood Demon Art.
In the Demon Slayer series, the Blue Spider Lily is a rare and mystical flower that plays a crucial role in the storyline. It's said to have the power to grant demons immunity to sunlight, making it a highly sought-after flower by the main antagonist, Muzan Kibutsuji ¹.
The Anti-Kibutsuji Drug is a unique and extremely powerful drug that was made with the sole purpose of defeating the Demon King, Muzan Kibutsuji.
A shy teenager living in Japan while his parents work abroad, Akira absorbs the powers of the devil Amon thanks to his friend Ryo Asuka. Then as the self-proclaimed title character Devilman (デビルマン, Debiruman), Akira starts fighting numerous enemies hidden in the world.
Muzan has always been a rational character, but fans believe killing his doctor is the only time he regretted taking a life.
Ranking of the 28 strongest characters in Demon Slayer 1/ Tanjiro the new Demon King 🌄 2/ Yoriichi the Sun Hashira 🌅 3/ Muzan the Demon King 💀 4/ Kokushibo the First Upper Moon 🌙 5/ Doma the Second Upper Moon ⛄ 6/ Giyomi the Rock Hashira ✴ 7/ Akaza the Third Upper Moon ❄ 8/ Sanemi the Wind Hashira 💨 9/ Giyu the Water ...
Also the reason why Nezuko was already so powerful is because Muzan injected tons of blood in her body and the others in hopes of creating a demon that could conquer the sun.
The black coloration of Tanjiro's sword is due to the unique nature of his sword and its interaction with sunlight. The black color of Tanjiro's Nichirin Blade is an indication of its rarity and exceptional quality.
However, in terms of potential and lore within the series, the Nichirin blade that becomes red, especially when Tanjiro Kamado wields it, holds a significant place. The red Nichirin blade is noted for its ability to prevent the regeneration of demons, making it exceptionally potent against them.
This stunning blade, with its pristine white hue, represents purity and strength. The White Nichirin Blade Sword is meticulously forged to ensure exceptional sharpness and perfect balance, making it ideal for both display and martial arts practice.
While many Hashira died in the fight, some survived: Giyu Tomioka, the Water Hashira, and Sanemi Shinazugawa, the Wind Hashira, both survive the final fight, carrying on the memory of their fallen comrades. Tanjiro also survives, and after the war, the Demon Slayer Corps disbands because demons are gone for good.
Swordsmith Village Arc
After falling into a coma in the aftermath of his battle against Upper Rank Six, Tanjiro Kamado dreams of memories belonging to his ancestor Sumiyoshi. Within them, Yoriichi is seen holding a newborn Sumire as her mother sleeps.
1. Tanjiro Kamado: The Burden of Loss. Tanjiro Kamado's story is one of the most emotionally impactful narratives in "Demon Slayer." His peaceful life in the mountains with his family is shattered when a demon attacks, killing his parents and siblings.
Anne was a kind and loving soul and was described as the only person that Muzan had truly loved, besides his three daughters. Though, she had a bit of a temper which flared when she became annoyed (which passed onto all three of her children); she deeply loved them and only wanted in life for them.
Why is Muzan depicted as a female character? During a meeting with the Lower Ranks, Muzan disguised himself with a female form to lull the demons into a false sense of security.