Sigil of Hermes Trismegistus
From Arkham Horror Wiki
Sigil of Hermes Trismegistus is a spell. It first appeared in the The Lurker at the Threshold expansion.
Card info
Casting Modifier: -1
Sanity Cost: 1
Casting phase: Any Phase
Effect: Cast and exhaust when you or another player attempts to close a Gate. That player receives a +2 to the check.
