The Cthulhu Compendium

Core Dice Checks & Success Levels

How skill and characteristic rolls work in Call of Cthulhu 7th Edition (Critical, Extreme, Hard, Regular, Failure, Fumble).

Bonus and Penalty Dice

Rules for rolling multiple tens dice when circumstances provide significant advantages or hindrances.

Pushing Skill Rolls

The high-stakes mechanic allowing an investigator to re-attempt a failed roll by taking extra risks.

Opposed Rolls & Resolving Ties

How contested actions between two active characters (e.g. Stealth vs Listen, Grapple vs Dodge) are resolved.

Luck Spending & Luck Recovery

The optional and standard rules for spending Luck points to alter dice rolls.

Sanity, Trauma & Insanity System

Complete mechanics for Sanity loss, Involuntary Actions, Temporary, Indefinite, and Permanent Insanity.

Bouts of Madness Tables (1d10)

The official Real-Time and Summary tables for determining the specific behavior during a Bout of Madness.

Combat, Fighting Back & Maneuvers

Call of Cthulhu 7th Edition combat sequence, attacker vs defender resolution, maneuvers, and outnumbering.

Ratched’s Children

HQ: Arkham, Massachusetts

Former asylum patients and fringe alienists banded together to investigate the unnatural horrors that caused their institutionalization and prove their sanity to the world.

The "Wipers" Pals

HQ: London, England (with branches …

Comrades from the Third Battle of Ypres (Passchendaele) who witnessed supernatural abominations in no-man’s-land and sworn to protect humanity from the encroaching horrors.

The Nine

HQ: Clandestine / Distributed (Meets …

An ancient, secretive esoteric network dedicated to gathering, securing, and cataloging dangerous arcane relics and occult tomes before they trigger cataclysms.

The Resurrectionists

HQ: Boston / Arkham, Massachusetts

Medical anatomists, grave exhumers, and biological researchers who study unnatural anatomical specimens and physiological immortality.

The Society for the Exploration of the Unexplained

HQ: Beacon Hill, Boston, Massachusetts

A prestigious, endowed scholarly fellowship that finances rigorous scientific expeditions into psychical phenomena, anomalous ruins, and paranormal folklore.

The South 13th Street Gang

HQ: Lower East Side, New …

Defending neighborhood turf, bootleg supply lines, and innocent residents from bizarre unnatural killings, strange cults, and sewer-dwelling entities.

The Westley Isynwill Foundation

HQ: Chicago, Illinois

A philanthropic trust granting funds, legal defense, and equipment to intrepid independent investigators confronting anomalous threats to human civilization.

Wrath’s Circus of Wonders

HQ: Travelling Troupe (Winter quarters …

Travelling across country presenting circus spectacles while secretly tracking and exacting vengeance upon the sinister Cult of the Blue Petal.