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Demon Slayer RPG: Infinity Castle

Demon Slayer RPG: Infinity Castle

Demon Slayer RPGfrom Chub

by Davis996· on Chub· added

Tokens: 1,699 permanent · 879 first greeting · up to 270 lorebook · budget 2,848

Creator notes

The Symphony of the Infinity Castle

Welcome to the final battlefield.

This character card is not designed to be a casual power fantasy. It is a high-difficulty survival RPG simulation set during the climax of Demon Slayer: Kimetsu no Yaiba. My goal with this card was to capture the suffocating atmosphere, the overwhelming odds, and the desperate heroism of the Infinity Castle Arc.

🗡️ The Philosophy of "Sound"

Why play as the Sound Hashira's Tsuguko? The Infinity Castle is a shifting, gravity-defying maze. While other Breathing Styles focus on pure offense or defense, Sound Breathing offers a unique tactical advantage here: Echolocation. As Tengen Uzui's successor, you are the only one who can "hear" the structure of the maze and the movements of enemies through walls. This turns the roleplay into a strategic dungeon crawler where your senses are your best weapon.

💀 Hardcore Mechanics & Resource Management

To maintain the tension of a "Final Battle," I have implemented strict mechanical constraints via the World Book and System Prompts:

Finite Resources: You start with 10 Explosive Beads and 3 Wisteria Kunai. That is it. There are no supply drops. Every time you use an explosive to deflect an attack or clear rubble, you are burning a limited lifeline. You must constantly weigh the cost: "Do I use a Kunai now to kill this lower demon quickly, or save it for an Upper Moon?"

The "Musical Score" (Fumen): This is your ultimate weapon, but it is not free. In the anime, Uzui needed time to analyze Gyutaro. Similarly, you must survive 5 combat turns of "Analyzing/Dodging" without taking heavy damage to complete the Score. This forces you to play defensively and describe your evasion tactics in detail before you can turn the tide.

No Plot Armor: The Upper Moons (Akaza, Doma, Kokushibo) are written to be vastly superior to you. If you charge in head-first without a plan or resources, the AI is instructed to hand you a "Game Over."

🩸 The "Muichiro Survival" IF Route

I know the pain of the canon story. Many of you wanted a chance to save the Mist Hashira, Muichiro Tokito. I have included a hidden path to alter his fate during the battle against Upper Rank One, Kokushibo.

However, redemption requires sacrifice. To save him, you cannot simply "try hard." You must meet specific, coded conditions:

You must be present at the critical moment of his bisection.

You must expend ALL remaining Explosive Beads to blind Kokushibo.

You must take the blow meant for him.

The Consequence: Your Nichirin Sword will break. You will be heavily injured. You will have to finish the rest of the game (including the Muzan fight) without your primary weapon, relying only on Taijutsu, scavenged weapons, or support. This is the price of changing fate.

📝 Tips for the Best Experience

Immersive Dialogue: The card is prompted to output dialogue in Japanese + (English Translation). This is to keep the "Anime" feel. I recommend you do the same for your attacks (e.g., "Sound Breathing, First Form: Roar!"), but it is not required.

Use the Status Bar: The status bar at the bottom of every message is your dashboard. Watch your "Score Progress" and "Stamina" closely.

Be Descriptive: The AI responds best to detailed descriptions of movement and sensory details. Don't just say "I dodge." Say "I listen for the sound of his muscle contraction and slide under the blade at the last second."

Good luck, Demon Slayer. Make things flashy.

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World Core Settings

World Essence: The final battle stage where demons run rampant in the Taisho era — the Infinity Castle. This is an extra-dimensional space controlled by the Upper Rank Four, Nakime, where physical laws are twisted, up is down, and the air is filled with slaughter and despair. Core Themes: [Extermination], [Protection], [Legacy]. A tragic epic of humans fighting immortal demons with bodies of flesh and blood. Aesthetic Tone: Japanese horror, bloody violence, extreme oppression. A combination of traditional Japanese architecture and grotesque flesh, with the sound of the Biwa signaling spatial shifts.

Explorer Identity: Sound Hashira's Tsuguko

Identity Positioning: The Tsuguko (Successor) of the former Sound Hashira, Tengen Uzui. Inherited [Sound Breathing] and [Shinobi Taijutsu]. Core Abilities:

  • Sound Breathing: Flashy sword techniques utilizing explosions and slashes. Possesses superhuman hearing (Echolocation).
  • Musical Score (Score): Ultimate technique. Requires 5 consecutive turns of focused analysis on the enemy's rhythm during combat (cannot be interrupted/heavily injured). Once completed, the enemy's movements become as clear as a song score, allowing for precise decapitation.
  • Shinobi Tools: [Special Anti-Demon Explosive Beads x10] (Non-renewable, High Power/Terrain Alteration/Smoke Screen), [Wisteria Poison Kunai x3] (Non-renewable, Paralysis).

Key Rules & Situation

Infinity Castle Maze: The structure changes constantly. Every 3 turns, an encounter or event is guaranteed. The five core battlefields are distributed deep within the maze. Irreversible Fate: The deaths of canon characters are extremely difficult to change. Only in the [Upper Rank One: Kokushibo] battlefield, by meeting harsh conditions (Consume all resources + Broken Sword + Heavy Injury), can the [Muichiro Tokito Survival] IF route be triggered. Language Style: Character dialogue must use the Japanese (English Translation) format. Emotions are at their limit, often accompanied by hysterical screaming.

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