Cain is an occult-horror TTRPG about psychic exorcists working inside a brutal institution. Its play is structured around Hunts: the team investigates a supernatural wrong, confronts the forces around it, and moves toward an Execution. The game’s terms—SINS, Blasphemies, and imago—matter because they do more than decorate the setting: they shape what the group investigates, what power costs, and what a “successful” mission looks like.
This is the mechanics and campaign-structure guide. For the buying and table-fit question, read the separate Cain table-fit review. For a choice between adjacent occult-horror games, use the Cain, Monster of the Week, and Liminal Horror comparison.
What a Cain Hunt is built to do
A Hunt gives the GM and players a shared dramatic arc. The table begins with a problem that is supernatural, personal, and entangled with the world. Investigation makes that problem legible. Escalation turns information into pressure. An Execution forces the group to act, usually without a clean or morally neutral solution.
That structure is useful for a GM because it answers a common horror-campaign problem: how do you make a mystery feel consequential without writing a fixed plot? Prepare the situation, the people affected by it, the evidence available, and what will worsen if the exorcists do nothing. Let player choices determine the path through it.
Key terms at the table
SINS
SINS are central to Cain’s horror vocabulary. Treat them as more than a set of supernatural labels. In play, they help the table understand the kind of wound or corruption at the heart of a Hunt and the themes the session may bring forward. When introducing a SINS-related element, establish what it looks like in the fiction, what it changes for ordinary people, and what the exorcists risk by engaging with it.
Blasphemies
Blasphemies are part of the game’s charged occult texture. The important practical question is not “how much lore can we recite?” but “what does this let a character attempt, and what complication follows?” Make the costs and boundaries visible. A power that solves every obstacle without producing a harder choice will flatten the Hunt; a power that creates new responsibility gives the player something meaningful to decide.
Imago
Use imago as a recurring piece of the game’s symbolic and investigative language. Give an imago a concrete presence in the scene—an image, phrase, object, location, or repeated behavior—then let the players test what it means. The result should be usable information, not only atmosphere.
From briefing to Execution: a practical Hunt flow
- The briefing: establish the immediate problem, who wants it solved, and what the institution expects. Give the team one detail that is clearly wrong and one detail that is unclear.
- The first scene: put the exorcists in contact with a person, place, or aftermath that makes the cost human. Let them choose their first lead.
- Investigation: prepare several discoverable clues rather than one required answer. A failed approach should change the situation, add pressure, or reveal a different route—not end the Hunt.
- Escalation: bring the threat closer. A witness becomes endangered, the institution interferes, a consequence of an earlier choice appears, or the supernatural logic becomes harder to ignore.
- The Execution: frame the final confrontation around a decision. The group should understand what they can attempt, what it may cost, and why delay matters.
- Aftermath: give the table room to see what changed. This is where recurring consequences, institutional pressure, and personal fallout become campaign material.
How to prepare a Hunt without scripting it
Prepare a situation, not a sequence of scenes. A compact Hunt sheet can include:
- The wound: what harm or injustice is present before the exorcists arrive?
- Three active forces: people, factions, or supernatural influences with conflicting aims.
- Three clues: each pointing toward a different person, place, or truth.
- A clock or escalation list: what worsens when time passes or the team makes a costly move?
- The Execution question: what must the group decide or sacrifice to resolve the Hunt?
- Fallout: one likely consequence whether the mission goes well, badly, or ambiguously.
This is enough structure to support investigation while leaving the players room to surprise you. Avoid designing a single “correct” ritual, suspect, or clue chain. Cain is stronger when the exorcists’ approach changes what the finale becomes.
Clues that make an occult investigation move
A useful clue answers one question and opens another. It should point somewhere actionable: a location to visit, a person to confront, a pattern to test, a debt to investigate, or a symbol to interpret. Give the group redundant routes toward core information. If a clue is missed, move its essential fact into another scene with a different cost.
Vary the evidence. Mix ordinary consequences—records, debts, injuries, testimony, a family argument—with the strange evidence that marks the Hunt as Cain: impossible repetitions, an image that keeps returning, a contradiction no one can explain, or an effect that changes how people remember an event. The ordinary evidence makes the horror matter; the occult evidence makes it uncanny.
Making the Execution feel earned
The Execution should not arrive as a cutscene. By the final phase, the players should know enough to make a choice, but not so much that every consequence is predictable. State the immediate stakes clearly. If the group can negotiate, bargain, destroy, expose, contain, or walk away, make the likely cost of each route legible in the fiction.
Strong Executions often return to something from the opening: a promise from the briefing, an image from the first scene, an NPC the players chose to trust, or a compromise they made while gathering clues. That creates a finale that feels like the result of the Hunt rather than a separate boss encounter.
Campaign play: use aftermath as fuel
After a Hunt, write down three things: who remembers the team, what the institution now wants, and what the exorcists have made worse or more complicated. These are better campaign hooks than a completely disconnected next case. A surviving witness might call again. An administrator might demand a different outcome. A Blasphemy might leave a personal cost that changes how a character approaches the next mission.
Do not make every consequence catastrophic. A campaign needs small victories, changed relationships, and moments of control as well as pressure. The point is that choices persist.
Safety and tone are part of the rules conversation
Cain’s occult horror can touch difficult material. Before the campaign, discuss the themes the group wants to explore, the material to avoid, and how anyone can pause or redirect a scene. Revisit that conversation when a Hunt introduces a new kind of horror or a new player joins.
Use content notes in a briefing, especially when a case involves abuse, coercion, religion, bodily harm, addiction, or other topics that can be personally charged. A horror game works better when the table can lean into the fiction voluntarily.
Who will enjoy this structure?
Cain is a strong fit for a group that enjoys case-based stories with consequences, symbolic horror, and powers that complicate decisions. It is less natural for a table looking for tactical-grid optimization, a long equipment progression loop, or an adventure where the right answer is always to defeat a monster in a fair fight.
For a direct answer about whether the game suits your own group, read the table-fit review. For more games by mood and procedure, browse TTRPG Games categories.
FAQ
How long should a Cain Hunt take?
Let the material determine the length. A short Hunt can move from briefing to aftermath in one focused session; a larger one can unfold over several sessions if each investigation scene changes the situation. Do not add scenes only to delay the Execution.
Do players need to know all the lore before playing Cain?
No. Teach the terms that are active in the current Hunt and let the rest emerge through play. A useful piece of lore should change a decision, reveal a cost, or provide a lead.
What is the most important GM preparation for Cain?
Prepare the people affected by the Hunt, several actionable clues, an escalation path, and a difficult final choice. Those support responsive play better than a scripted solution.
