Oppressive Atmosphere
From Arkham Horror Wiki
Oppressive Atmosphere is a mythos card. It first appeared in the Innsmouth Horror expansion.
Card Information
Mythos Type: Environment (Mystic)
Gate Opens: Devil Reef
Clue Appears At: *Esoteric Order of Dagon
  
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Mythos Ability: While this card is in play, all monsters gain Nightmarish 1. Any monster that already has Nightmarish has its Nightmarish rating increased by 1.
