The Call of Cthulhu Keeper Decks are designed to provide game resources, useful 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 convey information.

• Strange Characters: A range of friends and foes, with game traits and stories, providing additional NPCs and replacement investigators. 48 cards.
• Phobias: Detailed effects of phobias, manias, or episodes of madness, each card describes and advises on the consequences of investigators' insanity. 48 cards.
• Weapons and Artifacts: Detailed melee weapons, items, and Cthulhu Mythos items. Each card describes the game's weapon stats, as well as supporting historical information. 48 cards.
• Unfortunate Events: All kinds of strange, unfortunate, and disastrous situations that can affect, hinder, and perplex your investigators. Use it in the game to add extra drama and twists for your investigators. 48 cards.