Summary
- Nezuko's immunity to sunlight changes the game, potentially leading to defeating demons entirely.
- Muzan's nearly immortal regeneration makes him a psychological threat beyond just physical power.
- The Infinity Castle's reality-bending nature traps the Demon Slayers, giving Muzan total control of the battlefield.
With the conclusion of the Hashira Training arc, fans of Demon Slayer cannot wait to see the next season, the Infinity Castle arc. The ending of the Hashira Training arc was super tense and exciting. The long-awaited battle between the Demon Slayers and Muzan and his upper demons will take place in the Infinity Castle. What began as the journey of a boy trying to save his little sister, who is a demon, has now reached a crucial defining moment of their lives.
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For viewers of Demon Slayer, this beautifully animated series has built up to this battle with a series of key events. A lot of important developments will shape the outcome of the Infinity Castle arc, from Muzan’s regeneration ability to the structure of the Infinity Castle. For those heading into Demon Slayer's Infinity Castle arc, these are the things they need to know beforehand.
This article contains heavy spoilers from the Demon Slayer manga; proceed with caution.
8 Nezuko’s Immunity To Sunlight Changes Everything
The Power That Turns The Tide Of Battle
- Importance: Could be the key to defeating demons entirely.
An iconic moment in Demon Slayer was when Nezuko survived being in the sunlight and was able to finally talk to her brother, Tanjiro. Nezuko becoming a demon was one of the main reasons why her brother became a Demon Slayer. Her breaking free from a demon's inability to walk in the sun caught Muzan’s eye.
Muzan is more than eager to find Nezuko now, as her ability could be what stands between him and his idea of perfection. If Muzan gets hold of her, it could cause a big problem. She could be a key game changer, as her power can make or break the Demon Slayers.
7 Muzan’s Near-Immortal Regeneration Makes Him Terrifying
The Demon That Just Won’t Die
- Importance: Makes Muzan a psychological threat as much as a physical one.
Muzan Kibutsuji, the first and original demon, has a terrifying ability to regenerate quickly. One incredible display of this ability was when Kagaya Ubuyashiki, the leader of the Demon Slayers, set a suicidal trap for Muzan, who finally found the whereabouts of his home. As mind-blowing as the trap was, Muzan came out alive and regenerated quickly. Even the Nichirin sword, which is used to kill demons, is not capable of defeating him by simply beheading him.
Demon Slayer: The Only Character Who Can Rival Muzan
Muzan Kibutsuji was nearly unrivaled in Demon Slayer—until one warrior pushed him to the brink like no other before or after.
With over a thousand years of experience, his superb abilities, and the Upper Demons with him, the Demon Slayers defeating Muzan feels nearly impossible. Muzan is not an ordinary demon, so the Demon Slayers need to be prepared to face their most difficult opponent ever.
6 The Mysterious Power Of The Demon Slayer Marks
The Awakening Of A Secret Weapon
- Importance: May be the only way to match Upper Moons and Muzan.
From the very first episode, Tanjiro has always had a mark on his face. It was only recently that viewers learned that it is a Demon Slayer Mark. In the Swordsmith Village arc, Muichiro and Mitsuri, both Hashira, joined Tanjiro by meeting the conditions required to activate the mark.
Fans are curious and left wondering whether the remaining Hashira will also awaken their markings and join the likes of Tanjiro in the Infinity Castle arc. The Demon Slayer Mark boosts the owner's strength, which should be extremely useful since the Slayers are to face their arch-enemies.
5 The Hashira’s True Strength Will Finally Be Unleashed
No Holding Back This Time
- Importance: Stakes remain high as the tide turns in favor of the Demon Slayers.
Until now, the anime has only hinted at the Hashira's true potential, from Rengoku’s tragic duel with Akaza to Tengen’s face-off in the Entertainment District and the most recent fight in the Swordsmith Village. While each one gives a glimpse of the Hashira’s individual brilliance, fans have not seen the strength of all the Hashira combined.
The Infinity Castle arc will change that. With the surviving Hashira gathered in the castle, their strength will be tested like never before. In a battlefield designed to give the demons the upper hand, the Hashira will need to unleash their strongest techniques, synchronize, and evolve in order to survive. It's no longer about personal glory—it’s about collective survival.
4 Zenitsu’s Thunderous Calm In The Face Of Death
Stillness That Hides A Storm
- Importance: Zenitsu is no longer just a comic relief character; he’s become a true fighter.
Zenitsu has always been a fun and jovial character. He constantly panics in the face of danger, yet displays immense power when fighting in his sleep. After receiving a mysterious letter, his demeanor changed. Whatever was written in the letter has clearly shaken him, and he is showing an unexplainable calmness.
Demon Slayer: How Will Zenitsu Impact the Infinity Castle Arc
As Demon Slayer's Final Arc Approaches, Tanjiro and others will try to finally stop Muzan. What will Zenitsu's contributions be in this battle?
Viewers have seen the scared Zenitsu and the unconscious warrior, but this new version is different and exciting. Zenitsu shows no fear as he enters the castle, which is unusual for this character. As the Infinity Castle arc approaches, this composed Zenitsu may reveal a level of strength he’s never consciously accessed before.
3 Nezuko Is No Longer Fighting Beside Tanjiro
A New Solo Battle Begins
- Importance: Tanjiro is forced onto the battlefield without Nezuko's support.
Watching Nezuko grow has been one of the most rewarding parts of Demon Slayer. From the quiet girl who spends most of her time in a box to the fierce demon fighting beside her brother, her journey has been wild. And Tanjiro? He’s grown too—every fight, every scar, all because he wants to protect her.
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But now, things have shifted. Nezuko can’t fight by his side anymore—she has to hide from Muzan, and that changes everything. Tanjiro’s going into battle without her strength beside him. It’s just him, his blade, and the hope that he makes it back to her.
2 Muzan’s Growing Desperation Is Pushing Him To Madness
A Relentless Obsession With Immortality
- Importance: Makes Muzan more reckless and dangerous.
For Muzan Kibutsuji, it seems everything is starting to fall into place. He finally located the Demon Slayer Corps Headquarters and killed Kagaya Ubuyashiki, the leader of the Demon Slayers. To top it off, Nezuko's conquering of the sun has opened up a nice opportunity for him to reach his goal. If everything works out for him, he will attain full immortality.
As success is seemingly within his reach, Muzan becomes more and more obsessed. This makes him scarier than he has ever been. As the Infinity Castle approaches, Muzan’s desperation will intensify, making him unpredictable and very dangerous.
1 The Infinity Castle’s Reality-Bending Nature Is A Nightmare
Muzan’s Battlefield Is Designed To Trap The Demon Slayers
- Importance: Gives Muzan total control of the battlefield.
The first peek viewers got of the Infinity Castle was in season 1 when Muzan summoned his Lower Moons. The Castle defies the laws of physics as it is constantly changing and feels like an endless maze. Walls can move, rooms can shift, and gravity can change its direction.
The structure of the Infinity Castle makes it not only the location of the battle but also a weapon that Muzan can use against his opponents. Its complex passages make it unimaginable to escape without defeating the one controlling it. The Demon Slayers have entered a very dangerous trap where they face not only Muzan, but also the environment itself.
- Release Date
- April 6, 2019
- Network
- Adult Swim
- Seasons
- 4
- Studio
- ufotable
- Creator
- Koyoharu Gotoge
- Number of Episodes
- 63
