What Is The Blue Spider Lily, And Why Does Muzan Want It So Badly?

Pavas Gagneja
Jun 16
3 min read

What Is The Blue Spider Lily And Why Muzan Wants It So Badly

SPOILER ALERT: This article contains major spoilers from the Demon Slayer manga, including shocking plot points, final battles, and major plot twists not yet covered in the anime. Proceed only if you're caught up or don't mind having key story elements revealed.

The Blue Spider Lily is one of the biggest mysteries connected to the main villain, Muzan Kibutsuji. Right from the beginning, it’s made clear that Muzan is searching for this flower, and he’s been looking for it for centuries. But why? What makes it so special? What is the Blue Spider Lily? And why can't he find it?

If you’re a fan of Demon Slayer, you know how careful and powerful Muzan is. He’s smart, ruthless, and stops at nothing to get what he wants. So the fact that one small flower has kept him running in circles for hundreds of years tells us how important it is. Let’s break down what the Blue Spider Lily really is, what it does, and why it means everything to Muzan.

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What Is The Blue Spider Lily?

The Blue Spider Lily is a very rare and possibly mystical flower that only blooms under certain conditions. It was originally used by the doctor who tried to cure Muzan when he was a human. This doctor gave Muzan a special medicine made from the Blue Spider Lily in hopes of saving his life.

Instead of curing him in the normal sense, the flower’s medicine ended up turning Muzan into a Demon. It gave him a powerful body, immortality, and superhuman abilities, but it also came with a weakness: Muzan could no longer walk in the sun. This side effect became his biggest curse.

Why Muzan Wants It So Badly

Muzan doing experiments during the Upper Moon meeting

Ever since he became a Demon, Muzan has been obsessed with finding the Blue Spider Lily again. He believes that if he finds it, he can reverse his sun weakness and become truly unstoppable — a Demon that can walk under the sun with no fear. That’s been his main goal for centuries.

It’s also the reason he creates and spreads Demons. Muzan hopes that one of his Demons might evolve or find the Blue Spider Lily for him. He even experiments on them and tries to create the perfect Demon; someone who can conquer the sun. That’s why Nezuko became such a threat to him later on in the story.

Why Is It So Hard To Find?

One of the reasons Muzan hasn’t found the Blue Spider Lily is because the flower is extremely rare. It only blooms during the day and for a very short period; sometimes just once a year or even less. And since Muzan can’t go out in the sun, he can’t search for it himself.

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On top of that, the exact location of the flower has been lost to time. No one really knows where it grows anymore. Some say it’s hidden in deep mountains, others think it’s already gone extinct. Muzan has sent Demons to look for it, but no one has ever come back with results.

Was The Flower Ever Found?

Muzan Kibutsuji and the Blue Spider Lily

By the end of Demon Slayer, the Blue Spider Lily is never actually found by Muzan. In fact, we learn that Tanjiro’s family may have unknowingly had access to the flower. There’s a scene where the flower is shown blooming near the Kamado family’s home, but since they never realized its value, it remained hidden.

Muzan’s failure to find the Blue Spider Lily becomes one of his greatest weaknesses. He tried to play god, but he couldn’t overcome the power of nature, and that’s kind of poetic when you think about it.

Final Verdict: Muzan Gave His Life Trying To Find It

The Blue Spider Lily is a symbol of Muzan’s desperation, his fear of death, and his desire to become the perfect being. It gave him his power, but also cursed him forever. And despite all his strength, his biggest enemy turned out to be something as simple as the sun, and a flower he could never find.

In the end, Muzan’s obsession with the Blue Spider Lily shows that even the strongest monsters have limits. He wanted to be immortal, but he couldn’t escape the consequences of what he had become.