Player's Handbook · Chapter 1

Welcome to the Unknown

You are an investigator: a detective, doctor, scholar, reporter, soldier, priest, or simply someone who noticed that the world does not make sense. You are not a superhero. You are a person with useful skills, imperfect information, and a mind that can be damaged by what it learns.

The game is about pursuing mysteries and deciding what you are willing to risk for the truth. One player presents the world, its witnesses, dangers, and consequences. Everyone else plays an investigator. Speak in character when you can, describe what you attempt, and let the dice decide uncertain outcomes.

What you need

Bring an investigator sheet, a way to roll percentile dice, and a willingness to ask questions. Your investigator needs a name, occupation, background, skills, equipment, and reasons to keep going when retreat would be wiser.

The game moves between investigation, conversation, travel, danger, and recovery. Most scenes do not require a roll. Roll when failure matters, the outcome is uncertain, and the situation cannot be solved simply by explaining what you do.

Your first principles

Ask before you act. What do you see? Who benefits? What has changed?
Use the right skill. A clue may be found through observation, research, science, social pressure, or intuition.
Work together. An investigator's weakness is often another investigator's specialty.
Treat violence as dangerous. A gun can end a threat, but it can also begin a worse one.
Make the horror personal. Your relationships, fears, beliefs, and responsibilities are part of play.

A session in brief

A mystery usually begins with a hook: a disappearance, a strange letter, an impossible crime, or a witness who should not be alive. You follow leads by searching places, questioning people, and researching records. Complications consume time and draw attention. Eventually you reach a revelation, confrontation, escape, or terrible choice.

The Keeper describes the situation. You say what your investigator does. If the result is obvious, it happens. If the result is uncertain, choose a relevant skill and roll. The Keeper describes the consequences, and the investigation moves forward.

You will not always win. Success may mean escaping with proof, saving one person, or learning the truth soon enough to act. Survival is valuable. So are the people who remember what happened.

Manual updated Aug 18, 2026.

Trapped in fog over Point Nemo, the RMS Olympic is no longer a luxury liner—it’s a slaughterhouse. Cthulhu cultists hunt passengers in a sadistic ritual to wake their god, while Deep Ones storm the decks to reclaim the abyss for Dagon. As rival horrors compete in the carnage, panic turns genteel survivors into monsters. Trust is dead; betrayal is certain. You must expose the conspiracy and escape the high-seas sacrifice, or become another offering to the things below. Dare you board?

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@Solodit

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CreatedAug 18, 2026

UpdatedSep 17, 2026

The Premise

Six hours to dawn. Six hours until R'lyeh wakes.

For four days the RMS Olympic has carried 2,400 souls across the Pacific in Edwardian comfort. Tonight her engines are dead, an iridescent fog has swallowed the ship, and she drifts above Point Nemo — the loneliest point on Earth — anchored with terrible precision over the sunken city of R'lyeh, where dead Cthulhu waits dreaming.

At 11:00 PM, a fanatical cult begins the Rite of the Sunken God: passengers slaughtered one by one, their lives drained through carved sigils into a stolen idol before the planets align at 5:15 AM. But the cult does not own this night. Deep Ones storm the decks to drag the idol back to the abyss. A Mi-Go plague quietly harvests the lower decks. And a Royal Navy detachment bleeds for a ship it cannot save.

You are not a rescue party. You are a passenger with six hours on the clock and four horrors who each have a plan — and every plan ends with the ship. Break the chant, steal the idol, sink her yourself, or watch the stars rearrange over a boiling sea. Dare you spend the night aboard?

Glimpses

Author's note

Staring Location = Starting Quest and the unique beginning of your survivor's story..

Whenever you select a starting location, you will be thrusted right into a scenario to roleplay. You won't quite know what's happening at any location until you start but you can always restart at a different location.

I made sure every starting location is unique and interesting and furthermore, I have extra instructions under Game Settings you could enable to enhance your adventure. All in testing at the moment as I myself play my own adventure and update them.

Traveling between areas of the ship will spawn different enemies, you can see what enemies spawn there by checking it's properties from the map.

To Do: Adding New Monsters, I have done so already. Place them on the map Remove SAS reference, changed time setting to be early 20th century, a bit too early for SAS, swapped with Navy. Long Term Addition: May add Navy R'lyegh Expansion - Navy picks up distress message from the Olympic but is now caught in the fog and is in communication with a submarine beneath it. This will be the return to innsmouth style follow up scenario where players will start on the Navy Vessel on the surface or the submarine below. Antagonists will be Deep Ones and Star Spawn.

Completed: Add new characters - Details in disc Add Ballroom and Armory POI.

World Map