Infinity Castle.. || Infinity castle Arc lorebook!

The Demon Slayer Corps plunges into the Infinity Castle to defeat Muzan. Shinobu engages in a fierce fight against Doma, the Upper-Rank 2 demon. Poison doesn't work on him, so she finds herself in an intense struggle. Will she be able to defeat the demon who killed her older sister? Then another demon appears before Zenitsu and blocks his way.[1]

Tanjiro Kamado and Giyu Tomioka confront Akaza, the Upper-Rank 3 demon. Against Akaza's overwhelming strength, the two find themselves unable to do anything but defend themselves. With the situation looking grim, Tanjiro awakens to the "Transparent World" his father once told him about. Will this new knowledge allow Tanjiro to turn the tables and go on the offensive against Akaza?[2]

The Demon Slayers fight hard to get their blades closes to Muzan's neck. To avenge her family, Kanao must continue to battle Doma head-on, while Obanai Iguro and Mitsuri Kanroji find themselves slashing through the shifting rooms of the Infinity Castle. Elsewhere, Muichiro Tokito, Sanemi and Genya Shinazugawa come face-to-face with a villain who recognizes Tokito, but Tokito doesn't know him. Who is this powerful adversary?

The Infinity Castle is a pocket dimension consisting of lamplit wooden rooms, long halls, and moving corridors. It possesses a warped direction of gravity, allowing demons to stand upright, upside down, perpendicularly on the walls, or move in physically impossible directions. Its unusual structure and layout is controlled by Nakime's Blood Demon Art, allowing any structure within to shift at her will, though the castle additionally seems to move on its own.

Nakime's Blood Demon Art Nakime taking Muzan to the surface. Using her biwa, she can manipulate the position of any demon inside and take them to any location in her range. During the conclusion of the Lower Ranks Meeting, Nakime teleported Muzan to a balcony leading outside despite his original position being deep within the castle; Morever, the doors she used to close around him all seem to constantly shift within the unusual gravity, spinning within themselves as she changes its layout.[1]

The Infinity Castle's range seems to extend beyond its already incomprehensibly large area, as Nakime was able to manipulate Enmu and take him to an unknown town seemingly nowhere close to the castle, even dropping him in place using a supernatural vanishing door.[1] She was also able to transport Gyokko and Hantengu from the Infinity Castle to the Swordsmith Village after Muzan ordered them on a mission there.[2] During the Hashira's initial confrontation with Muzan, upon seeing them close in on him, Muzan gave Nakime the signal to open doors that caused them to fall into the castle, despite their initial location being in the extremely well-hidden Ubuyashiki Mansion. The location of the castle at that moment is transported to an area deep under the ground of a city, far away from where the Ubuyashikis predicted they would be.[3]

Infinity Castle - 3 Akaza encounters Doma's palace, on his way to the Upper Rank meeting. Only certain demons seem to be aware of the Infinity Castle's existence, as Akaza did not have any difficulty traversing across the dimension, making use of its unusual gravity and shifting rooms to make his way across,[2] whereas the Lower Ranks during their gathering with Muzan were completely out of their element; when Wakuraba attempted to escape Muzan attempting to kill him, no matter how far and how quickly he ran, he remained trapped within the same area of the Infinity Castle.[1] However, since Nezuko Kamado's immunity to sunlight was revealed, lesser demons have been seen gathering in large numbers in the Infinity Castle.[4]

Infinity Castle - 6 The region of shifting rooms, with Akaza on the central moving column. Due to its unusual warped gravity, impossible structures can be formed within the Infinity Castle. During Akaza's path to the Upper Rank meeting, he fell hundreds of stories past the warped corridors and halls and flew past a large and ornate water garden palace, only to "fall" further past, reaching what seemed to be the bottom and landing onto the floor. This was then revealed to be a wall that was formed in the direction of the shifting columns below him and he was then taken high above the columns and past the ceiling through opening doors, coming across a large maze-like area filled with towering pillars.[2]

Due to the absence of sunlight within the fortress, demons are able to reside in the castle full-time, even during daytime when the sun is up. The walls of the fortress prevent any penetration of light and ensures that there is no risk of demon inhabitants being burned by sunlight, providing them with a secure haven.[5] Synopsis

Rehabilitation Training Arc

The Lower Moons gathered Lower Ranks are gathered in the Infinity Castle. The Infinity Castle first appears when Muzan calls the Lower Ranks to a meeting in which he decides to dismantle them, killing them all apart from Lower Rank One, Enmu, who he lets live as his sadistic personality and honour to die by his hand was seen as the right mindset by the Demon King.[6][7] Nakime was responsible for summoning each member to the castle, through her biwa.

Swordsmith Village Arc

Muzan inspects the status of the Upper Ranks The Upper Ranks are gathered in the Infinity Castle. Following the deaths of the dual holders of Upper Six, Daki and Gyutaro, Muzan, through Nakime, subsequently summoned all of the remaining Upper Ranks to the Infinity Castle to relay his disappointment in them and discuss a new plan of action. Kokushibo was the first to arrive to the castle, while Akaza was the last.[8]

After the deaths of Gyokko and Hantengu, as well as the revelation of Nezuko Kamado being immune to the sun, Muzan gathers all of the demons in the country, turning them into mindless demons with the strength of a Lower Rank. These demons would later be seen as cannon fodder to be used against the various members of the Demon Slayer Corps.

Hashira Training Arc

Sanemi and Obanai see the Infinity Castle Sanemi and Obanai find the Infinity Castle. While on a mission to rescue a kidnapped woman from a demon, Wind Hashira Sanemi Shinazugawa and Serpent Hashira Obanai Iguro unknowingly entered an entrance to the Infinity Castle. It appeared as an abandoned castle in the middle of a dense forest, with numerous demons lurking within the building. As they tried to capture the demon they were pursuing, they leapt into what they believed was the inside of the castle, only to see the Infinity Castle's endless corridors and halls. The castle, sensing the Hashira, began to collapse and quickly vanish from view as a room that the demon had escaped into was quickly shut, causing the surrounding to revert back immediately and Sanemi's sword to slash directly into the ground. The two are left confused at what they had just witnessed.[4]

The Demon Slayers converge as the Infinity Castle opens Muzan traps the Hashira and Tanjiro inside the Infinity Castle. Having the foresight to predict the arrival of Muzan, Corps leader Kagaya Ubuyashiki laid a trap during his confrontation with the Demon King. Muzan, seeing his wife and two of his children present, did not sense anything out of the ordinary when he attempted to kill him and was staggered when a powerful explosion destroyed the mansion. He was then trapped by a Blood Demon Art of giant bramble branches and was injected by a hidden Tamayo with a special drug to convert him into a human. Gyomei Himejima then arrived to behead him, which fails when Muzan instantly regenerates his head. The rest of the Hashira and Tanjiro Kamado arrive, but as they attempt to corner the immobile Muzan, Nakime opened doors beneath them all, trapping the Demon Slayers within the Infinity Castle.

Infinity Castle Arc

Demon Slayers and Crows inside the Infinity Castle Kasugai Crows fly through the horde of plummeting Demon Slayers. During the final assault against demons by humanity, the castle held many notable battles. These included Doma's clashes with Shinobu, Kanao, and Inosuke, Tanjiro and Giyu battling Akaza, Muichiro, Genya, Sanemi, and Gyomei facing Kokushibo, Zenitsu's duel with Kaigaku, and Mitsuri's and Obanai's skirmish with Nakime. Throughout the castle, numerous lesser demons, all having comparable strength to the Lower Ranks, were also present. These demons were sent to attack anyone, including the rest of the trapped non-Hashira Demon Slayers, as part of Muzan's plan to exhaust them for him to kill more easily.

During the second clash of the Demon Slayers against Muzan, Nakime was controlled by Yushiro in order to prevent him from seeing Mitsuri and Obanai, having used a talisman of his Blood Demon Art to trick Muzan seeing through Nakime's eye. Worried that Yushiro would take control of her and use the Infinity Castle to their advantage, Muzan activated the curse on Nakime by killing her through telekinesis, and subsequently caused the Infinity Castle to grow unstable. Prior to the Castle's collapse, Yushiro harnessed Nakime's cells just before their disintegration to transport Muzan and the Demon Slayers outside. He caused the entire structure to ascend, breaking through the ground and emerging onto a city street surface.[9] The ruins and debris of the Infinity Castle were present all throughout the battle against Muzan, and many had to find their way out of the wreckage before actually fighting Muzan himself. However, as the creation of a dead demon, whose progenitor was killed subsequently, the Infinity Castle was left permanently destroyed.