This article is written by guest contributor Kyle Lantion. Kyle is an avid comic fan and loves all things comic-related. So much so that his favorite tabletop hobby is painting minis for Marvel Crisis Protocol and other miniatures. When he’s not painting, he’s probably playing in or Judging Flesh and Blood TCG Tournaments all around the city.
What is the Infinity Castle?
Have you ever seen those trippy artworks by M.C. Escher? Specifically the one titled “Relativity” where the stairs are on the walls and the people are walking upside down and right side up. Imagine that but a thousand times more confusing and infinitely more rooms. That is what the Infinity Castle is. Serving as the main base of operations of the Twelve Kizuki and Muzan as well as the stage for the penultimate arc of Demon Slayer, the Infinity Castle is a massive subspace consisting of numerous rooms, stairwells, balconies, and corridors. This massive fortress can manifest anywhere at any time and bring the occupants inside anywhere they wish. Muzan utilizes this ability by using the castle to move vast distances in mere seconds. He also eventually uses the castle to abduct the Hashiras as well as Tanjiro and friends as a door opens under everyone’s feet, sucking them into the castle.
How does it work?
The Infinity Castle is actually one big manifestation of a Blood Demon Art! Whose you might ask? Well, this huge dimension is the Blood Demon Art of Upper Moon four, Nakime. She controls the castle using her biwa, a large stringed instrument that she strums to make the corridors and walls shift around to her will. While it’s not explicitly confirmed whether or not the other demons within know how to navigate the castle in its entirety but, it’s clear that all occupants within are at the mercy of Nakime (Except Muzan, of course). There are however instances, especially with the other upper moons, wherein demons who are used to the castle make full use of its strange gravity and structure to traverse to different areas. No one knows just how deep or vast the castle is as it is shown to be constantly shifting and moving on its own. We saw a glimpse of this depth during the scene where Akaza makes his way to the Upper moon meeting and seemingly falls hundreds of feet, even passing by another castle in the middle of water, before landing on what appears to be a wall that instantly sprouted from a pillar.
What else can it do?
Aside from looking like the shifting halls of Hogwarts, the space within the castle seems to exist in a dimension of its own and is at the complete mercy of Nakime and her biwa. We’re not entirely sure whether Muzan or Nakime need to know the locations beforehand, but the castle can manifest anywhere they desire as a door leading to the outside. Evidently, Nakime is able to forcibly move, hold, and lead individuals through doors and corridors in the castle. We see this when Muzan is transported to a balcony on the outside of the castle even though he was in a deeper part of the building previously.
The castle also appears to be semi-sentient to some degree. Walls and corridors are shown to be constantly shifting on their own, even without Nakime strumming her Biwa. The castle also serves as the main base of operations for the demons under Muzan’s command as the innate structure of the castle blocks sunlight even during the middle of the day. Regardless of how big the castle actually is, one thing is for certain. Being summoned to the Infinity Castle can be a matter of life or death.
Watch how everyone got summoned into the Infinity Castle in Demon Slayer, which is now currently finished its 4th Season on Netflix
You know who fell into the Infinity Castle and looked like he’s ready to COOK? Zenitsu! Find out more about him below.
