Updated on February 13, 2:10 p.m. (GMT+8): Added images.

The Demon Slayer franchise created by Koyoharu Gotogue possesses exceptional worldbuilding, with beautiful and diverse locations that act as the battleground for the heroes and villains.

Funko POP Animation: Demon Slayer- Tanjiro Kamado
Credit: Funko
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The Infinity Castle, among all the places featured in the series, emerges as the most enigmatic. If you’re curious about the inner workings of this mystical fortress, delve deeper into its secrets.

Discover the reason behind this location serving as the gathering hub for the mightiest demons in the series.

Warning: Spoilers if you have yet to watch Season 1 of the anime, the Demon Slayer 2023 movie, or Chapters 52 and 98 of the manga.

Everything you need to know about the Infinity Castle in Demon Slayer

Demon Slayer official key visual
Credit: ufotable

The Infinity Castle is a massive and complex structure that serves as the secret base of the series’ main antagonist, Muzan Kibutsuji, and the lair of the Twelve Demon Moons.

Funko POP Animation: Demon Slayer - Muzan Kibutsuji
Credit: Funko
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It first appeared when Muzan summoned all the Lower Rank demons to his castle after the events from the Rehabilitation Training Arc. The Demon King was so disappointed with the weaker demons that he terminated all of them except Enmu, the Lower Rank one demon who inhabited the Mugen Train.

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The second time it showed up was when Upper Rank Six demon siblings Gyutaro and Daki were defeated by the Demon Slayer Corp. Muzan had all the Upper Rank demons teleported to the castle to discuss a new plan of action against the Hashira.

All Demon Slayer Hashira with a caption that ranks them from weakest to strongest
Credit: ufotable, ONE Esports
Find out who the strongest Hashira in Demon Slayer here

The only inhabitant in the castle is Nakime, the Biwa Demon whose power is to teleport other teams into the Infinity Castle on Muzan’s command.

The castle is also known as the Dimensional Infinity Fortress because of its labyrinthine structure and intricate design. Everything in it, including the rooms and platforms, can be moved by Nakime at will.

The location will also play a pivotal role in the later arcs of the anime.

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