Ring Around the Moon
From Arkham Horror Wiki
Ring Around the Moon is a mythos card. It first appeared in the Miskatonic Horror expansion.
Card Information
Mythos Type: Environment (Mystic)
Gate Opens: Esoteric Order of Dagon or Independence Square
Clue Appears At: Devil Reef or The Unnamable
  
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Mythos Ability: Each time an investigator in Arkham fails a Spell check, add a doom token to the doom track.
