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Overview

Mysteries are a type of Card. They are the primary objective of the game; the Investigators win the game by solving Mysteries in order to quell the Ancient One's rising. For most Ancient Ones, investigators must solve 3 Mysteries before the Ancient One awakens in order to win. If the Ancient One awakens, the investigators will normally have to solve an additional final Mystery which is significantly harder in order to win the game.

Some Mysteries are specific to one space on the board, in which case a Mystery Token is used to indicate that the active Mystery is on a particular space.

Mysteries always resolve at the end of the Mythos phase, after which a new Mystery is drawn, or investigators win the game.

Mystery Types

There are many different kinds of Mysteries, but each of them fits roughly into one of the following categories:

Research Encounter

Each Ancient One will usually have a Mystery wherein the investigators need to solve Research Encounters in order to place Clues on the Mystery to solve it. These Research Encounters are specific to each Ancient One. When investigators have solved a sufficient amount of Research Encounters and placed the Clues gained from these encounters onto the Mystery card, the Mystery is solved at the end of the Mythos phase. This number is usually equal to the number of investigators (Number of Investigators Icon), or half that number. Any fractions are rounded up.

Defeat Epic Monster

Another common type of Mystery is one wherein investigators need to slay a spawned Epic Monster. The toughness of these Monsters generally scales with the Number of Investigators Icon. These "Mystery Monsters" also often have special requirements in order to damage them, such as the Hydra which requires the active investigator to possess the Sword of Y'ha Talla in order to damage it. These Monsters are generally very powerful and usually require the efforts of multiple investigators to take down.

Special Encounter

Ancient Ones may also have a set of Special Encounter cards; some Mysteries require the investigators to encounter and successfully resolve a certain number of these cards in order to be solved. Special Encounters are generally more difficult than their Research Encounter counterparts, but have a wider variety of tests so that not only Observation specialists will be the best to handle them.

Item Requirement

Some Mysteries require the investigators to acquire a specific item (usually an Artifact). For example, Yig's Mystery, "Crown of the Serpent", requires the investigators to retrieve the Serpent Crown Artifact, perform a Will test, spend Clues, and then discard Ally Assets in order to solve the Mystery. In order to make these Mysteries fair, the Mystery often allows investigators to acquire the specific item they need if they would acquire an item from the specific item's category (i.e. if you would gain an Artifact, you may choose to gain the Serpent Crown instead).

Eldritch Tokens

Mysteries may sometimes spawn a number of Eldritch Tokens on the board. As encounters, investigators are usually required to perform various tasks successfully in order to place the Eldritch tokens on the Mystery card. Similar to the Research Encounter Mystery type, these Mysteries will often require a number of Eldritch tokens equal to or half the Number of Investigators Icon.

This type of encounter is the most varied. Some will require the discarding of items, while others may have the investigator Ambushed by Monsters. Typically, if the encounter is resolved successfully, the Eldritch token is discarded from the board. As with Research Encounters, any item that advances the mystery should not remove an Eldritch token from the board, but should use an unused token to mark the Mystery card.

Final Mysteries

When an Ancient One awakens, with the exception of Azathoth, investigators will need to solve a Final Mystery in addition to the regular Mysteries in order to win the game. These Final Mysteries will often involve either directly confronting the Ancient One as a Monster, or successfully resolving a certain number of Special Encounter cards. Unlike other Mysteries, the Final Mysteries are not normal cards; they are printed on the back of the Ancient One sheets in their top right corner.

Advancing the Mystery

Other than performing the task listed on the card, there are other ways to complete the Mystery. Some Assets like the Treasure Map, Tasks like Seek the Truth, or stages on an Adventure can "advance" the Mystery, making it easier to complete. How specifically the Mystery advances depends on the Mystery type.

If the Mystery is one that places Eldritch Tokens on a card or on the board, place an unused Eldritch Token on the Mystery. Do not remove any from the board.

If the Mystery requires spending Clues to place a Clue on a card, use an Eldritch Token to stand in for the Clue. If Clues are spent all at once to solve the Mystery, investigators will need to spend one less Clue in order to do so.

If the Mystery involves an Epic Monster, that Monster loses 2 Health. This health is placed on the Mystery card, so an Epic Monster like The Brood, which doesn't spawn immediately, still loses that 2 health once it appears.

Some extremely rare cards like the Promise of Power can completely solve a Mystery. If this happens, simply turn over the next Mystery at the end of the Mythos Phase. Remove the Epic Monster or any unused Eldritch Tokens when you do so.

List of Mysteries

Name Ancient One Set Type
Worshipers of a Forsaken Pharaoh Nephren-Ka 05
UtP Symbol - Small
Misc.
Haunter of the Dark Nephren-Ka 05
UtP Symbol - Small
Epic Monster
Stricken from History Nephren-Ka 05
UtP Symbol - Small
Research Encounter
Exploring Egypt Nephren-Ka 05
UtP Symbol - Small
Eldritch Tokens
The Beast Nephren-Ka 05
UtP Symbol - Small
Epic Monster
The Black Wind Nephren-Ka 05
UtP Symbol - Small
Special Encounter
Tomb of Nephren-Ka Nephren-Ka 05
UtP Symbol - Small
Final Mystery
Touched by Abhoth Abhoth 05
UtP Symbol - Small
Eldritch Tokens
Sealing the Caverns Abhoth 05
UtP Symbol - Small
Research Encounter
Exploring the Caverns Abhoth 05
UtP Symbol - Small
Special Encounter
Spawn of Uncleanliness Abhoth 05
UtP Symbol - Small
Eldritch Tokens
The Source of Filth and Disease Abhoth 05
UtP Symbol - Small
Research Encounter
Child of Abhoth Abhoth 05
UtP Symbol - Small
Epic Monster
Reign of Filth Abhoth 05
UtP Symbol - Small
Final Mystery
Discovery of the Cosmic Alignment Syzygy 04
SR Symbol - Small
Research Encounter
Plea to the Court of Azathoth Syzygy 04
SR Symbol - Small
Eldritch Tokens
Fortifying the Barrier Syzygy 04
SR Symbol - Small
Special Encounter
Unearthly Piping Syzygy 04
SR Symbol - Small
Misc.
Shrouded in Mysticism Syzygy 04
SR Symbol - Small
Misc.
Relics of the Ancient World Syzygy 04
SR Symbol - Small
Item Requirement
Sealing the Portal Syzygy 04
SR Symbol - Small
Final Mystery
The Winged Serpent Yig 02
FL Symbol - Small
Epic Monster
Migration of Serpents Yig 02
FL Symbol - Small
Research Encounter
Rise of the Serpent People Yig 02
FL Symbol - Small
Eldritch Tokens
Crown of the Serpent Yig 02
FL Symbol - Small
Item Requirement
Descendants of Yig Yig 02
FL Symbol - Small
Epic Monster
K'n-yan Unearthed Yig 02
FL Symbol - Small
Special Encounter
Serpent's Nest Yig 02
FL Symbol - Small
Final Mystery
Threatening Seas Cthulhu 02
FL Symbol - Small
Eldritch Tokens
Queen of the Deep Ones Cthulhu 02
FL Symbol - Small
Epic Monster
The Stone Circles Yog-Sothoth 02
FL Symbol - Small
Eldritch Tokens
Void Between Worlds Yog-Sothoth 02
FL Symbol - Small
Special Encounter
The Green Flame Azathoth 02
FL Symbol - Small
Epic Monster
Voice of Azathoth Azathoth 02
FL Symbol - Small
Item Requirement
Hour of the Moon Lens Shub-Niggurath 02
FL Symbol - Small
Eldritch Tokens
Blasphemy of the Black Goat Shub-Niggurath 02
FL Symbol - Small
Epic Monster
The Yellow Sign Hastur 06
SoC Symbol - Small
Eldritch Token, Research Encounter
Ravages of the Blight Hastur 06
SoC Symbol - Small
Misc.
Finding The Way Hastur 06
SoC Symbol - Small
Research Encounter, Item Requirement, Misc.
Spawn of Hastur Hastur 06
SoC Symbol - Small
Epic Monster
Cities on the Lake Hastur 06
SoC Symbol - Small
Special Encounter
The King in Yellow Hastur 06
SoC Symbol - Small
Special Encounter
Beneath an Alien Sky Hastur 06
SoC Symbol - Small
Misc.
He Who Is Not to be Named Hastur 06
SoC Symbol - Small
Research Encounter
The Third Act Hastur 06
SoC Symbol - Small
Special Encounter, Final Mystery
Mysterious Disappearances Elder Things 03
MoM Symbol - Small
Special Encounter
Invasion of the Elder Things Elder Things 03
MoM Symbol - Small
Epic Monster, Item Requirement
At the Mountains of Madness Elder Things 03
MoM Symbol - Small
Eldritch Token
Binding the Dark God Elder Things 03
MoM Symbol - Small
Misc.
An Alien Ritual Elder Things 03
MoM Symbol - Small
Misc.
An Expedition Compromised Elder Things 03
MoM Symbol - Small
Misc.
Discovery of an Ancient Civilization Elder Things 03
MoM Symbol - Small
Research Encounters
The Dark God's Prison Crumbles Elder Things 03
MoM Symbol - Small
Misc.
A Dark God Elder Things 03
MoM Symbol - Small
Special Encounter, Final Mystery
Hyperborean Aurora Ithaqua 03
MoM Symbol - Small
Item Requirement, Misc.
The Gnoph-Keh Attack! Ithaqua 03
MoM Symbol - Small
Research Encounter, Misc.
Growing Hunger Ithaqua 03
MoM Symbol - Small
Eldritch Tokens
Supplying The North Ithaqua 03
MoM Symbol - Small
Item Requirement, Eldritch Tokens
Exploring Hyperborea Ithaqua 03
MoM Symbol - Small
Special Encounter
A Spreading Storm Ithaqua 03
MoM Symbol - Small
Research Encoutner
Endless Winter Ithaqua 03
MoM Symbol - Small
Epic Monster, Final Mystery
R'lyeh Risen Cthulhu 01Core Special Encounter
The Deep Ones Attack! Cthulhu 01Core Eldritch Tokens
Watching The Stars Cthulhu 01Core Epic Monster
The Stars Are Right! Cthulhu 01Core Research Encounter
Rituals in the Wild Shub-Niggurath 01Core Eldritch Tokens
Nature of the All-Mother Shub-Niggurath 01Core Research Encounter
Spawn of the Black Goat Shub-Niggurath 01Core Epic Monster
Hunting the Thousand Shub-Niggurath 01Core Misc.
Arcane Understanding Yog-Sothoth 01Core Misc.
The Beyond One Yog-Sothoth 01Core Research Encounter
Where the Old Ones Broke Through Yog-Sothoth 01Core Misc.
Spawn of Yog-Sothoth Yog-Sothoth 01Core Epic Monster
The True Name Azathoth 01Core Eldritch Tokens
Occult Research Azathoth 01Core Research Encounter
Seed of the Daemon Sultan Azathoth 01Core Misc.
Omen of Devastation Azathoth 01Core Misc.
Master of Dreams Hypnos 07
TD Symbol - Small
Research Encounter
Descending the Steps Hypnos 07
TD Symbol - Small
Misc.
Visions of Hypnos Hypnos 07
TD Symbol - Small
Misc.
The Hubris of Man Hypnos 07
TD Symbol - Small
Artifact
Dream Within a Dream Hypnos 07
TD Symbol - Small
Special Encounter
Dreamwalker Hypnos 07
TD Symbol - Small
Special Encounter
Corona Borealis Hypnos 07
TD Symbol - Small
Special Encounter, Final Mystery
Shroud of the Spider-Mother Atlach-Nacha 07
TD Symbol - Small
Research Encounter
Severing the Links Atlach-Nacha 07
TD Symbol - Small
Misc.
Caught in the Web Atlach-Nacha 07
TD Symbol - Small
Misc.
Beasts from Beyond Atlach-Nacha 07
TD Symbol - Small
Misc.
The Brood Atlach-Nacha 07
TD Symbol - Small
Artifact, Epic Monster
Sleeper of N'kai Atlach-Nacha 07
TD Symbol - Small
Epic Monster
Cosmic Entanglement Atlach-Nacha 07
TD Symbol - Small
Epic Monster, Final Mystery

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