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Overview

Mythos cards are a primary method through which the game will cause the investigators to lose.  The third phase of every round is called the Mythos Phase, where a Mythos card is drawn from the Mythos deck.  After resolving its effects, play continues to a new round.  There are three types of Mythos cards with three different difficulties.

Mythos Deck

At the start of the game, players must build the Mythos Deck from the 217 Mythos cards available (as of Masks of Nyarlathotep). The Mythos Deck is built according to the composition of Green, Yellow, and Blue Mythos cards as indicated on the Ancient One sheet being played.

Every Mythos deck is split into three separate Phases. Each Phase is created and shuffled independently of another, and then put back together with the third Phase on the bottom, the second Phase in the middle, and the first Phase on the top.

Before constructing the Mythos Deck, modify the difficulty of the deck as you wish. Then, separate the Green, Yellow, and Blue cards into three separate decks and shuffle each deck.

For each Phase, check the Ancient One sheet; draw a number of colored Mythos cards as specified by the Phase that you are constructing, and then shuffle these cards together, then set them aside. It is recommended that you construct the deck from Phase 3 to Phase 1 so that you can simply stack the Phases on each other when you are done constructing each.

Finally, recombine the Phases, and set aside the remaining Mythos cards; those cards will not be used for the current game.

Triggering a Mythos Card

When a Mythos card is drawn, players should resolve all of its icon effects from left to right as they are listed at the top bar of the Mythos card. After all icons effects have been resolved, the Mythos card's main effect should be resolved.

Mythos Card Icons

Icon Name Symbol Effect
Advance Omen Advance Omen Move the Omen Tracker Token clockwise 1 symbol, then advance Doom accordingly
Reckoning Mythos Reckoning Resolve Reckoning effects in the following order: Monsters, Ancient One, Mythos Cards, Investigators
Spawn Gates Spawn Gates Spawn a number of Gates and Monsters according to the Reference card being used
Monster Surge Monster Surge Spawn X Monsters on each Gate corresponding to the current Omen, where X is noted by the Reference card being used. If no Gates are present that correspond to the current Omen, spawn 1 Gate instead
Spawn Clues Spawn Clues Draw and spawn Clues according to the Reference card being used
Place Eldritch Tokens Eldritch Token Place a number of Eldritch Tokens as listed on the symbol on the Mythos Card that triggered this effect
Spawn Rumor Spawn Rumor Place a Rumor token on the space indicated on this symbol

Deck Depletion

If a Mythos Card needs to be drawn, but the Mythos Deck is empty, the Mythos Phase ends immediately. This will possibly trigger the solving of a final Mystery, in which case the investigators win the game. However, if investigators have not won by this point, they automatically lose the game.

Mythos Card Types

Green Mythos Card

Example of a Green, Hard Mythos Card

Green Mythos Cards

Green Mythos Cards are generally the second most common Mythos card; they will always cause the Omen to advance, trigger a Monster Surge, and spawn Clues.  The Monster Surge and spawning of Clues is determined by the Reference card being used.

Green Mythos cards will usually have an immediate event, although some will have an ongoing effect.

As of Masks of Nyarlathotep there are 78 Green Mythos Cards: 20 Easy, 37 Normal, 21 Hard. 

Yellow Mythos Card

Example of a Yellow, Easy Mythos Card

Yellow Mythos Cards

Yellow Mythos Cards are generally the most common Mythos card; they will always cause the Omen to advance, trigger a Reckoning, and spawn Gates. The spawning of Gates is determined by the Reference card being used.

Yellow Mythos cards always trigger an immediate event.

As of Masks of Nyarlathotep there are 92 Yellow Mythos Cards: 22 Easy, 41 Normal, 29 Hard.

Blue Mythos Card

Example of a Blue, Normal Mythos Card

Blue Mythos Cards

Blue Mythos Cards are the least common Mythos card; they will always spawn Clues.

Blue Mythos cards always initiate a Rumor. Often, Eldritch Tokens will be placed on the card in order to keep track of when the Rumor's fail effect triggers; the starting number of Eldritch Tokens, should they be required, is printed on the symbol on the top bar of the Mythos card.

As of Masks of Nyarlathotep there are 47 Blue Mythos Cards: 11 Easy, 19 Normal, 17 Hard.

Mythos Card Difficulties

Mythos cards are also differentiated by difficulty. Difficult Mythos cards are indicated by a red tentacle border around the Mythos card's name, while easy Mythos cards are indicated by a blue frost border around the Mythos card's name. Mythos cards without a border around their name are "normal" difficulty.

If the players wish to make the game easier or harder, they may build the Mythos deck using cards only from one or more of these difficulty categories in order to modulate the difficulty of the game. For example, removing all difficult Mythos cards creates a Mythos deck consisting of only normal and easy difficulty Mythos cards, which will make the game easier to win.

Mythos Cards List

Name Type Difficulty Set
"Moved to Boston" Blue Easy 06
SoC Symbol - Small
A Bomb in the Car! Yellow Medium 09
MoN Symbol - Small
A Breakthrough! Yellow Easy 06
SoC Symbol - Small
A Brief Respite Yellow Easy 03
MoM Symbol - Small
A Dark Path Green Hard 03
MoM Symbol - Small
A Helping Hand Yellow Easy 03
MoM Symbol - Small
A Proposition Green Easy 01Core
Abandon Hope Yellow Hard 08
CiR Symbol - Small
Abandoned Goals Green Medium 03
MoM Symbol - Small
Accursed Fortune Green Medium 08
CiR Symbol - Small
Against All Odds Green Medium 04
SR Symbol - Small
All For Nothing Yellow Hard 01Core
Archaeological Breakthroughs Green Easy 05
UtP Symbol - Small
At All Costs Green Medium 09
MoN Symbol - Small
Augur of Destruction Yellow Hard 08
CiR Symbol - Small
Awakening the Old Ones Blue Medium 06
SoC Symbol - Small
Bad Karma Green Hard 08
CiR Symbol - Small
Bargain With Nyarlathotep Blue Hard 06
SoC Symbol - Small
Beginning of the End Green Hard 04
SR Symbol - Small
Best Laid Plans Yellow Medium 08
CiR Symbol - Small
Best Man for the Job Yellow Medium 07
TD Symbol - Small
Blood Flows Green Medium 01Core
Blood Rites Yellow Hard 08
CiR Symbol - Small
Burn It All Down Yellow Easy 08
CiR Symbol - Small
Buying Information Green Easy 01Core
Calamitous Fortune Yellow Hard 06
SoC Symbol - Small
Call to Duty Green Easy 03
MoM Symbol - Small
Calling the Elder Things Green Medium 01Core
Candles in the Window Green Easy 08
CiR Symbol - Small
Cold White Silence Blue Medium 03
MoM Symbol - Small
Collector's Gift Green Easy 09
MoN Symbol - Small
Corrupted Business Green Medium 04
SR Symbol - Small
Cosmic Backlash Green Easy 08
CiR Symbol - Small
Crime in the Streets Yellow Hard 03
MoM Symbol - Small
Curse of Knowledge Yellow Medium 05
UtP Symbol - Small
Dark Captivation Green Easy 09
MoN Symbol - Small
Death of Innocence Green Medium 09
MoN Symbol - Small
Desperate Times Yellow Hard 01Core
Devourer of Stars Blue Easy 03
MoM Symbol - Small
Did We Make It? Yellow Easy 05
UtP Symbol - Small
Dimensional Instability Green Medium 01Core
Dimensional Shift Green Medium 07
TD Symbol - Small
Dimensions Collide Blue Hard 01Core
Doorways to Tuonela Blue Medium 07
TD Symbol - Small
Down the Rabbit Hole Yellow Easy 07
TD Symbol - Small
Drawn Through the Gate Blue Easy 07
TD Symbol - Small
Drawn to Our World Blue Medium 02
FL Symbol - Small
Dream of Lands Beyond Blue Medium 05
UtP Symbol - Small
Dreamcatcher Yellow Hard 07
TD Symbol - Small
Driven to Bankruptcy Green Medium 01Core
Driven to Madness Yellow Medium 02
FL Symbol - Small
Echoes of a Past Life Green Easy 09
MoN Symbol - Small
Edge of Reason Yellow Easy 09
MoN Symbol - Small
Everyone Has a Price Yellow Easy 01Core
Everything Is Under Control Yellow Medium 06
SoC Symbol - Small
Evil Never Sleeps Green Hard 02
FL Symbol - Small
Exploring the Crater Blue Medium 08
CiR Symbol - Small
Eye of the Storm Blue Hard 04
SR Symbol - Small
Eyes Everywhere Yellow Hard 01Core
Faded From Society Blue Medium 01Core
Fair Winds Yellow Easy 09
MoN Symbol - Small
False Bargain Green Medium 03
MoM Symbol - Small
Far Corners of the Globe Blue Hard 04
SR Symbol - Small
Feast of Umordhoth Green Medium 09
MoN Symbol - Small
Food for Worms Green Hard 05
UtP Symbol - Small
Forgotten Knowledge Green Medium 05
UtP Symbol - Small
Fractured Reality Blue Easy 01Core
Framed for Murder Yellow Medium 07
TD Symbol - Small
From Beyond Green Hard 01Core
Fruit of Labor Yellow Easy 09
MoN Symbol - Small
Gate Burst Green Hard 07
TD Symbol - Small
Gaze Into The Abyss Yellow Hard 09
MoN Symbol - Small
Gaze of Ghatanothoa Yellow Hard 04
SR Symbol - Small
Ghostly Chanting Blue Hard 06
SoC Symbol - Small
Glimmer of Hope Green Easy 04
SR Symbol - Small
Glimpse the Lurker Yellow Hard 05
UtP Symbol - Small
Growing Madness Blue Easy 01Core
Heart of Corruption Green Easy 01Core
Hideous Apparitions Yellow Medium 08
CiR Symbol - Small
Hindering Agony Green Medium 03
MoM Symbol - Small
I Am Legion Green Medium 06
SoC Symbol - Small
Impending Doom Yellow Hard 03
MoM Symbol - Small
It Could Be Worse Green Medium 07
TD Symbol - Small
Lead Astray Green Medium 06
SoC Symbol - Small
Leap of Faith Green Easy 07
TD Symbol - Small
Leave the Rest Behind Yellow Easy 09
MoN Symbol - Small
Legitimate Banking Green Medium 01Core
Losing Hope Green Hard 03
MoM Symbol - Small
Lost Knowledge Blue Easy 01Core
Madness From the Sea Blue Hard 05
UtP Symbol - Small
Mass Hysteria Yellow Medium 06
SoC Symbol - Small
Milk of the All Mother Green Hard 05
UtP Symbol - Small
Mission Delores Blue Easy 08
CiR Symbol - Small
Moment of Prescience Green Easy 07
TD Symbol - Small
Mysterious Benefactor Yellow Easy 03
MoM Symbol - Small
Mysterious Lights Blue Hard 01Core
Night Terrors Green Medium 09
MoN Symbol - Small
Nightmarish Dreams Blue Medium 07
TD Symbol - Small
No Peace For the Fallen Green Medium 01Core
No Time To Be Alone Green Hard 06
SoC Symbol - Small
No Turning Back Green Hard 07
TD Symbol - Small
Old Wounds Yellow Medium 08
CiR Symbol - Small
Omen of Disaster Yellow Hard 07
TD Symbol - Small
Omen of Good Fortune Yellow Easy 01Core
Out of the Aeons Blue Medium 04
SR Symbol - Small
Outbreak! Yellow Hard 03
MoM Symbol - Small
Over My Dead Body Green Hard 06
SoC Symbol - Small
Overabundance Yellow Medium 05
UtP Symbol - Small
Overwhelming Swarm Yellow Hard 04
SR Symbol - Small
Painful Memories Green Easy 06
SoC Symbol - Small
Patrolling the Border Green Medium 01Core
Perplexing Stars Yellow Hard 01Core
Phantom of Truth Yellow Easy 06
SoC Symbol - Small
Plague of Misfortune Yellow Hard 08
CiR Symbol - Small
Plague of Vampires Yellow Hard 06
SoC Symbol - Small
Played for a Fool Yellow Medium 06
SoC Symbol - Small
Prepared For Anything Green Easy 03
MoM Symbol - Small
Price Gouging Green Medium 06
SoC Symbol - Small
Price of Progress Yellow Easy 04
SR Symbol - Small
Prophecy Fulfilled Yellow Medium 09
MoN Symbol - Small
Rally the People Yellow Easy 01Core
Relics of Old Blue Easy 04
SR Symbol - Small
Render of the Veils Blue Hard 07
TD Symbol - Small
Replaced By Another Green Hard 07
TD Symbol - Small
Return of the Ancient Ones Blue Medium 01Core
Return to G'harne Blue Hard 08
CiR Symbol - Small
Reversal of Fortune Yellow Hard 07
TD Symbol - Small
Righteous Calling Green Easy 04
SR Symbol - Small
Rigorous Training Yellow Easy 07
TD Symbol - Small
Rising Terror Green Hard 01Core
Safe Haven Yellow Easy 08
CiR Symbol - Small
Safely Guarded Secrets Blue Medium 04
SR Symbol - Small
Scavengers Blue Medium 07
TD Symbol - Small
Secrets of the Past Blue Easy 01Core
Shadow Beneath Chicago Blue Medium 05
UtP Symbol - Small
Silver Twilight Aid Yellow Easy 01Core
Song of Spheres Blue Hard 07
TD Symbol - Small
Spa Resort Weekend Yellow Easy 08
CiR Symbol - Small
Spreading Corruption Blue Hard 09
MoN Symbol - Small
Stars Aligned Blue Medium 01Core
Strange Affliction Yellow Medium 06
SoC Symbol - Small
Strange Energies Green Medium 04
SR Symbol - Small
Strange Sightings Green Hard 01Core
Support of the Church Green Easy 01Core
Tainted Rations Green Medium 02
FL Symbol - Small
That Which Consumes Green Easy 01Core
The Contagion Blue Easy 05
UtP Symbol - Small
The Crawling Chaos Blue Hard 03
MoM Symbol - Small
The Curtain Rises Yellow Medium 06
SoC Symbol - Small
The Dead Stars Yellow Hard 09
MoN Symbol - Small
The Earth Will Shake Green Hard 08
CiR Symbol - Small
The End is Nigh Yellow Hard 03
MoM Symbol - Small
The End Justifies the Means Yellow Medium 08
CiR Symbol - Small
The Forty Elephants Green Hard 09
MoN Symbol - Small
The Harder They Fall Yellow Medium 08
CiR Symbol - Small
The Horror in the Museum Blue Medium 03
MoM Symbol - Small
The Invisible Maze Green Medium 08
CiR Symbol - Small
The King in Yellow Blue Medium 06
SoC Symbol - Small
The Messenger Green Hard 05
UtP Symbol - Small
The Ones Left Behind Green Medium 05
UtP Symbol - Small
The Ravages of Time Yellow Hard 05
UtP Symbol - Small
The Rival Yellow Medium 09
MoN Symbol - Small
The Sky is Bleeding Green Hard 08
CiR Symbol - Small
The Storm Yellow Hard 01Core
The Time Has Come Green Hard 03
MoM Symbol - Small
The Ulama of Ibn Tulun Green Easy 05
UtP Symbol - Small
The White Ship Blue Hard 02
FL Symbol - Small
The Wind-Walker Blue Medium 01Core
The World Fights Back Yellow Easy 01Core
The Yellow Sign Yellow Hard 06
SoC Symbol - Small
Tied to a Dark Purpose Green Hard 01Core
Time Catches Up Green Medium 06
SoC Symbol - Small
Time is Running Out Blue Medium 03
MoM Symbol - Small
Together We Stand Yellow Medium 07
TD Symbol - Small
Torn Asunder Green Hard 01Core
Transported to the Hyades Blue Medium 06
SoC Symbol - Small
Treader of the Dust Blue Hard 05
UtP Symbol - Small
Trust No One Green Medium 07
TD Symbol - Small
Twin Spawn of Cthulhu Blue Hard 03
MoM Symbol - Small
Unexpected Betrayal Green Medium 01Core
Unhealthy Fascination Green Easy 06
SoC Symbol - Small
Unimaginable Horror Yellow Hard 05
UtP Symbol - Small
Unknown Dangers Green Medium 05
UtP Symbol - Small
Vile Wounds Green Medium 03
MoM Symbol - Small
Visions of Past Lives Yellow Easy 05
UtP Symbol - Small
Voice of Mammon Yellow Hard 09
MoN Symbol - Small
Voodoo Curse Blue Easy 05
UtP Symbol - Small
Waking Nightmare Yellow Medium 07
TD Symbol - Small
Wanderlust Yellow Hard 02
FL Symbol - Small
We're All Going To Die! Yellow Hard 04
SR Symbol - Small
Web Between Worlds Blue Hard 01Core
Weight of Avarice Yellow Medium 05
UtP Symbol - Small
What Lies Beneath Green Medium 08
CiR Symbol - Small
Wild Arcana Green Hard 04
SR Symbol - Small
With One Voice Green Hard 09
MoN Symbol - Small
Wonders of the World Yellow Easy 04
SR Symbol - Small
Worked to the Brink Yellow Medium 07
TD Symbol - Small
You Are Not Prepared Green Medium 08
CiR Symbol - Small
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