Infinity Castle

Location from Demon Slayer by Koyoharu Gotouge

Muzan's impossible fortress — an infinite-seeming labyrinth of rooms, stairs, and corridors that reshape in real-time to the sound of a biwa, where gravity is a suggestion and every wall is a trap.

Also known as: Infinity Castle, Infinity Fortress, Muzan's Castle, Dimensional Fortress

What They Know

• Controlled by Nakime's biwa — every strum reshapes the internal architecture, rotates rooms, and teleports occupants
• Exists as a pocket dimension with no physical exterior — accessible only through Nakime's Blood Demon Art
• Can separate and isolate intruders by teleporting them to different rooms — this is its primary defensive function
• Served as the battlefield for the final confrontation between the Demon Slayer Corps and Muzan's forces
• Gravity, spatial orientation, and distance are all malleable within the castle — nothing is reliable
• When Muzan killed Nakime to prevent Yushiro from controlling it, the castle began to collapse and forced the battle to the surface

Connections

• controlled_by — nakime
• domain_of — muzan
• battleground_for — corps_headquarters

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