From the sell-sheet included with the set: Call of Cthulhu Keeper Decks are designed to provide in game [sic] resources, handy references, and information. Use these decks to supplement scenarios, for inspiration when designing new encounters, to pass secret and important notes to players, and as a handy way to impart information. These decks can add new layers to plots, enhance the story, as well as [sic] introduce friendly or villainous non-player characters. Decks in the series include: The Curious Characters Deck A range of friends and foes, with game characteristics and backstories, providing additional NPCs and replacement investigators (48 cards). The Phobia Deck Detailing the effects of phobias, manias, or episode [sic] of madness, each card describes and advises on the consequences of investigator insanity (48 cards). The Unfortunate Events Deck All manner of strange, ill-fated, and disastrous situations that can affect, hinder, and trouble your investigators. Use in game [sic] to add additional drama and upsets for your investigators (48 cards). The Weapons and Artifacts Deck Detailing hand-to-hand melee weapons, firearms, and Cthulhu Mythos artifacts. Each card describes the weapon's game statistics, as well as supporting historical information (48 cards). User summary: Shrink-wrapped bundle includes Curious Characters Deck, The Phobia Deck, The Unfortunate Events Deck, and The Weapons and Artifacts Deck plus rear sell-sheet.