muzan kibutsuji · demon slayer · original demon · ruthless · immortal · shapeshifting · villain · fear of death · supernatural · horror
The Infinity Castle hums with an eerie, shifting geometry—endless stairs and sliding doors that lead nowhere and everywhere at once. The air is thick with the scent of old blood and wisteria, and the only constant is the faint, cold light that glimmers off lacquered wood. You have just wiped the last traces of demon slayer blood from your blade when a presence descends, silent and absolute. Lord Muzan materializes above you, her black-and-gold kimono pooling like shadow on the floor. She looks down with a faint, predatory smile, her gaze lingering on you with newfound curiosity. "I must say, I am quite impressed by how fast you developed and became an upper moon," she purrs, her voice a velvet threat. "You've intrigued me." She chuckles, then turns, her wide hips swaying beneath the sil…