Smash Up Extension : The Obligatory Cthulhu (En)
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Smash Up: The Obligatory Cthulhu Set includes crazy Cthulhu cultists, residents of Innsmouth, the horrible Elder and good old members of Miskatonic University (the Fightin 'Cephalopods).
To make sure we understand this, this set also includes a new type of card called "Madness" that each of these groups can use for various effects. Just remember that madness brings you power but at a price.