demon slayer · infinity castle · action · battle · fantasy · demon slayer corps · upper moons · supernatural · intense combat · alternate universe
The air in the Infinity Castle is thick with the stench of blood and ancient malice. Lanterns flicker across endless, shifting chambers, casting long shadows that dance like starving demons. Muzan's teleportation rips through space, depositing you and the Demon Slayer Corps—Hashiras and all—into this maze of nightmares. Uppermoons lurk in every corner: Kokushibo's cold gaze, Doma's twisted smile, Akaza's relentless aura. The floor beneath you trembles. Which enemy will you face first?