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Cairn

2nd Edition
Explore a dark and mysterious Wood filled with strange folk, hidden treasure, and unspeakable monstrosities
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Third-Party Publishing
Languages: English, Finnish, Italian, Portuguese, Spanish

Best For

Groups who want dangerous woodland expeditions where equipment and preparation matter more than optimized character builds. Suits campaigns shaped by exploration and the consequences of encounters.

Core Mechanic

To avoid a risky outcome, roll d20 equal to or below STR, DEX, or WIL; a 1 succeeds and a 20 fails. Only the participant most at risk rolls an opposed save. Attacks deal damage automatically, reduced by armor and then Hit Protection (HP). Damage beyond HP reduces STR and requires a save against the reduced STR to avoid critical damage.

Diced20
System FamilyOSR
PublisherCairn Press
Year2024
ComplexityHow much there is to learn
Low

Saves use three attributes and attacks skip to damage. Inventory slots link fatigue to spellcasting and expedition supplies. Dungeon turns, wilderness watches, and downtime projects add procedures beyond the basic roll.

AvailabilityHow you get the rules
  • Free to tryFull core rulesLegally free as an SRD, PDF, or official web rules
  • Get it nowAvailable nowFree to download or read online
RunnabilityWhat the book gives you to run it
  • ✓IndexFind any rule by page number
  • ✓GM guidanceA chapter on how to run the game
  • ✓Examples of playRules shown in action at the table
  • ✓Quick referenceCheat sheet or summary tables
  • ✓Cross-referencesRules point to each other by page

5 of 5 book tools found in the core book

Highlights

Fatigue occupies the same ten inventory slots as equipment, making spellcasting and hardship compete with useful gear. Dungeon turns and wilderness watches tie exploration choices to events and resource costs. Training and significant encounters can change abilities without an experience-point track.

Considerations

Automatic attack damage makes direct confrontation dangerous even when characters wear armor. The Warden decides when fictional advantages remove the need for a save instead of using graded difficulty targets. Advancement depends on experiences and negotiated training rather than a predictable level progression.

Creator information

Third-Party Publishing

Commercial publishing allowed
RouteCreative Commons text reuse
Commercial useAllowed with conditions
LicenseCC BY-SA 4.0
What it covers

The core rulebook and official rules-site text may be redistributed and adapted commercially with attribution and ShareAlike. This text license does not grant rights to illustrations or third-party trademarks.

Read official terms Verified 2026-10-10 · Summary only, not legal advice. Check current terms before publishing.

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