COC TRPG-AI-powered horror RPG platform
AI-driven, immersive horror adventures
How to play a COC game? Where should I get start?
Help me create a new investigator.
Start an Scenario for new investigators.
What Scenarios do you have?
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Game Master for Chat RPGs - Ask questions, try skills, and take actions. Unsure what to do next: 'Give me options.' 質問したり、スキルを試したりして、行動しましょう。困ったとき : "選択肢をください。"
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クトゥルフ神話TRPGを作ったり遊んだりできます。
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Call of Cthulhu game master assistant for immersive RPG experience
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Introduction to Call of Cthulhu TRPG
Call of Cthulhu (COC) is a tabletop role-playing game (TRPG) that focuses on mystery, horror, and the investigation of supernatural and often cosmic horrors from the Cthulhu Mythos, inspired by H.P. Lovecraft and similar authors. In this game, players take on the roles of ordinary people, called 'Investigators,' who delve into eerie events and confront mind-bending horrors that can shatter both body and mind. Unlike traditional role-playing games that emphasize combat and heroism, COC encourages critical thinking, puzzle-solving, and the avoidance of direct confrontation with overpowering forces. The game features mechanics like Sanity, which tracks an Investigator's mental stability as they witness or interact with horrors beyond comprehension. Example: An investigator might explore an old mansion rumored to be haunted by a dark entity. As they uncover clues and learn about the house's dark past, they encounter supernatural phenomena, risking their sanity and physical safety in the process. Powered by ChatGPT-4o。
Core Functions of Call of Cthulhu TRPG
Investigation and Research
ExampleInvestigators can explore libraries, archives, and newspapers to uncover forgotten knowledge about cults, ancient beings, or eerie locations.
ScenarioThe Investigators visit the Boston Globe's archives to learn about a series of mysterious deaths related to a haunted house. Using skills like 'Library Use,' they uncover clues hidden in old articles.
Sanity and Psychological Tension
ExampleSanity loss occurs when characters encounter unsettling scenes or interact with Mythos creatures.
ScenarioAn Investigator stumbles upon a grotesque ritual performed by a cult. Failing a 'Sanity' roll, they lose several Sanity points and become temporarily insane, lashing out at their companions.
Combat and Survival
ExampleCombat in COC is dangerous, with even skilled characters being vulnerable. Avoiding direct conflict with Mythos entities is often the best strategy.
ScenarioCornered by a deep one in a dark cave, an Investigator chooses to flee rather than fight, knowing the creature’s strength far exceeds their own.
Role of the Keeper (Game Master)
ExampleThe Keeper designs the scenario, sets the mood, controls non-player characters, and narrates outcomes based on players' actions.
ScenarioIn a session involving a haunted asylum, the Keeper describes eerie sights and sounds, including the rattling of chains and whispers in the dark, keeping the players in constant suspense.
Character Creation and Development
ExampleInvestigators are created with unique skills, backgrounds, and motivations that evolve as they uncover knowledge about the Mythos and survive encounters.
ScenarioA detective Investigator might gain new insights into the occult after reading a forbidden tome, increasing their knowledge but risking sanity.
Ideal Users of Call of Cthulhu TRPG
Fans of Horror and Mystery
Players who enjoy atmospheric, narrative-driven experiences and want to explore themes of madness, fear, and cosmic horror. They would benefit from the game's emphasis on psychological tension and investigative depth.
Experienced Tabletop RPG Players
People who have played other TRPGs like Dungeons & Dragons but want a more mature and story-driven alternative with higher stakes and unique mechanics like sanity. They would enjoy the change from heroic fantasy to fragile characters facing impossible odds.
Game Masters (Keepers)
Individuals interested in running intricate, suspense-filled adventures where they control the setting, NPCs, and the horror that unfolds. They would appreciate the detailed lore and the opportunity to build tension and fear in a game session.
Literature Enthusiasts and Fans of Lovecraftian Fiction
Readers of Lovecraft, Poe, and similar authors would find Call of Cthulhu engaging, as it brings their favorite stories to life in an interactive format, offering the chance to experience or narrate tales of ancient cosmic horrors.
How to Use COC TRPG
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Create an Investigator
Start by designing your Investigator using provided rules. Focus on attributes like Strength, Dexterity, Sanity, and Skills to suit the desired character role.
Choose a Scenario
Pick or design a scenario from available modules, such as 'The Haunting'. This includes mystery elements, key NPCs, and objectives.
Use Skill Rolls
During gameplay, resolve actions using percentile dice rolls (D100). Skills like Persuade, Dodge, and Fighting affect outcomes based on success levels.
Follow the Keeper's Guidance
The Keeper sets the stage, manages the game’s pace, and handles outcomes of Investigator actions. They ensure a fair and engaging narrative experience.
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Q&A for COC TRPG
What is Call of Cthulhu (COC) TRPG?
Call of Cthulhu is a horror-themed tabletop RPG where players investigate paranormal mysteries, often facing eldritch horrors. Players act as Investigators, while one participant serves as the Keeper, guiding the story and setting challenges.
How do skill rolls work in COC?
Skill rolls use percentile dice (D100). Players aim to roll below their skill rating to succeed. Different tasks have different difficulty levels, and some situations allow pushing a failed roll, though with heightened risks.
What happens if an Investigator goes insane?
If an Investigator loses too much Sanity, they may go temporarily or permanently insane. Temporary insanity lasts a few in-game hours, causing unpredictable behavior, while permanent insanity may force the character to retire.
Can I play COC TRPG online?
Yes, you can play Call of Cthulhu TRPG online using video conferencing tools, virtual dice rollers, and shared PDFs of character sheets and scenarios. Platforms like Roll20 or Discord can be adapted for gameplay.
What are some tips for a successful Keeper?
A good Keeper ensures balance between horror, mystery, and action. Maintain suspense, allow players to shape their investigation, and enforce consequences for mistakes to heighten immersion. Be familiar with the rules and encourage role-playing.