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Liminal Horror

"Normal people against the things that go bump in the night."

Free
Diced20 + d6 damage (Into the Odd-based)
Players3–5
Prep~10 min
Foundry VTTCommunity
Complexity
What is this system

A rules-light modern horror game built on the Into the Odd engine (by way of Cairn). Ordinary characters investigate creeping, cosmic dread — and the danger isn't just dying, it's coming apart. As the pressure mounts, STRESS accumulates and characters break down, gaining supernatural Fallout that lingers on them for the rest of the story.

Setting

The modern day, one thin membrane away from something wrong. Empty parking garages, liminal office corridors, small towns with a rot underneath. There are no monster manuals to memorize — the horror is bespoke, and the only tools are curiosity, nerve, and a willingness to talk it through.

What it looks like at the table
You corner the thing in the basement. There is no attack roll — the strike simply lands, d6 damage, and once your Hit Protection is gone the dice bite into STRENGTH. You survive the room. But the STRESS check fails, Critical Fallout triggers, and now your reflection lags a half-second behind you. That follows you home.
Playstyle
Horror Mystery Exploration Modern Weird
Key mechanics

STRESS & Fallout

Fear and strain build as STRESS. Fail a check and you roll on Fallout — lingering supernatural effects, not a mental-illness table. The mind frays into the weird.

Into the Odd combat

No to-hit rolls. Attacks land automatically for damage; survival rides on Hit Protection and ability scores. Fights are fast, lethal, and rarely worth starting.

Rulings over rules

About 35 pages. You can't lawyer your way out — the only exit from trouble is looking up from the sheet and talking to the table.

Free & open

Free web rules, free PDF, and a CC BY-SA SRD. A whole ecosystem of third-party modules and hacks builds on the same engine.

What people say
Liminal Horror is not a game where you can get out of trouble by flipping through the rulebook, the only way out is to look up and start talking to both your GM and the other people at your table.— Moreau Vazh, Taskerland
Art & materials
Free resources

Written and curated by Kejid — TTRPG player & GM

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