Stability

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Each location has a stability rating, indicated by a green (Stable Icon) or red (Unstable Icon) diamond on the location's area. Green locations are stable: monsters and gates will not appear in these locations, although monsters may still enter through normal movemment. Red locations are unstable: monsters or gates can appear in these locations as a result of an encounter or drawing certain cards (for example, a Mythos card).

Unstable locations, while more risky, also give players the possibility of encountering an Ally, and Clue tokens often appear in unstable locations when Mythos cards are resolved.