Mythos card
From Arkham Horror Wiki
The term Mythos may also refer to the Mythos phase, or to the Cthulhu Mythos, the literary source of Arkham Horror and The Call of Cthulhu
Mythos cards depict major events in Arkham. One is drawn each turn during the Mythos Phase. When a mythos card is drawn, it has several effects. It identifies a location where a gate opens, it determines monster movement in Arkham, and it presents an event that may affect the investigators. Most mythos cards also list a location where a Clue token appears.
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Mythos Types
Environment
An Environment Mythos card gives a description of an ongoing event happening in Arkham and surrounding areas. These events can have a beneficial or detrimental effect on the investigators by changing modifiers to different rolls or creating other special conditions. Some environment cards may detail an event or effect happening at a specific location or district.
Environment cards fall into three subtypes:
- Environment (Mystic)
- Environment (Urban)
- Environment (Weather)
There may only be one Environment effect in play at once. The effects of Environment cards stay in play until another Environment is drawn, regardless of subtype. If a new Environment card is drawn and resolved, all its effects take place during the Mythos phase (gate, monster, clue, monster movement) and upon resolving the new card's text, the old Environment is discarded. Some Ancient Ones completely negate the text of certain environment subtypes, allowing the other two subtypes to stay out for longer periods than they might ordinarily.
Headline
A Headline Mythos card, the most common type, gives a one-time effect, which may be beneficial, harmful, or neutral. Carry out the instructions on the card under the flavor text. Once this is done and the rest of the Mythos Phase is complete, discard the card to the bottom of the Mythos deck unless it directs you otherwise.
Rumor
A Rumor Mythos card has an ongoing effect (similar to an Environment card), a Pass condition and result, and a Fail condition and result (which is usually highly detrimental.)
Each turn the Rumor card continues in effect, its ongoing effect applies. If the Pass condition is ever met, usually requiring some action by the investigators, the result specified takes place and the rumor is discarded. If the Fail condition is ever met, the result specified takes place and the rumor is discarded.
While the Rumor card is in play, a second Rumor card can not enter play. If another Rumor card is drawn and resolved, all its other effects take place during the Mythos phase (gate, monster, clue, monster movement) but the second card's Rumor text itself is ignored.

