Call of Cthulhu (7th Edition): Malleus Monstrorum DeckA range of monsters with game characteristics and evocative artwork. Call of Cthulhu Keeper Decks are designed to provide in game resources, handy references, and information. Use the Malleus Monstrorum Deck when you need to reference a monster profile and when designing scenarios and encounters. These decks provide new layers to plots, enhance the story, and provide quick access to an array of fiendish foes. Other decks in the series include: The