Demon Slayer's Infinity Castle

The Infinity Castle is the ever-shifting, extradimensional lair of Muzan and his demons, controlled by the biwa player Nakime. It has no up or down, with rooms and stairs constantly moving.

In short, it's a **narrative masterpiece** because it:

Forces Epic Duels:** Instantly separates heroes to create focused, high-stakes battles (like the Hashira vs. Upper Moons).

Creates Ultimate Tension:** Traps the Demon Slayers in a disorienting maze, amplifying the feeling of despair.

Guarantees a Visual Spectacle:** Its mind-bending, impossible geometry is poised to be one of anime's most breathtaking sequences.

It's more than a location; it's the perfect stage for the final, tragic, and epic climax of *Demon Slayer*.