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.

From serene forests to bustling towns and cities, it never fails to immerse viewers in a fantastical world full of wonder and danger.

Among all the locations in the series, the Infinity Castle is the most mysterious of them all. If you want to know how this mystical fortress works, read on.

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.

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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.

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.

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.

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 upcoming arcs of the anime.

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