• Central and complete rulebook for the Arkham Horror role-playing game. • Includes character creation system, detailed city guides, and an introductory adventure. • Intuitive mechanics designed to prioritize narrative and decision-making. • Set in the 1920s with ancient terrors and primordial monsters. • Contains a complete bestiary and supernatural adversaries for the game master. • Designed for groups of 1 to 6 investigators from 14 years of age.