The Stacks (Guide)
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Early Firmament Content and Onwards |
| The Stacks Summary | ||||||||||||||
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| Variable-Length Activity | ||||||||||||||
| Setup | Progress | End | ||||||||||||
| 1 A | 6+ A | 5 A | ||||||||||||
| Progress
Details |
Play cards to raise  Perusing the Stacks, and then  Finding the Centre, to 40.
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| Raw EPA | (Variable) | |||||||||||||
How to unlock[edit]
This activity is unlocked while playing the 
Firmament storyline. You'll first enter the Stacks (the place where this activity takes place) at Firmament 120. Once you progress the story to Firmament 200, a permanent storylet, The Bone Gate, appears in 
The Midnight Moon. From there, you can reenter the Stacks and begin the activity.
Later, with Firmament 365, the storylet The Basalt Gate is available in 
Zenith. This is functionally the same as The Bone Gate, but returns the player to Zenith upon completion.
The Clamorous Cartographer[edit]
Once you hit 
An Interloper in the Library 4, you can purchase a special acquaintance, 
the Clamorous Cartographer for 10 FATE. This one-time purchase unlocks some additional options on the cards, and, after raising your acquaintanceship high enough, it also unlocks another book for you to find. In this guide, these options are marked with FATE.
Progress[edit]
The Stacks carousel is all about finding a book, bringing it to the reading room and reading it.
To do so, you must first choose which book you want to pursue. There are initially two options: the Index of Banned Works, 1899 Edition, and the Annal of Lost Stars. Each book provides different payouts, as documented in Reward Overview.
Once you've decided on your goal, the activity starts for real. It has two phases, both of which are progressed by playing cards in the Opportunity Deck:
When 
In Search of Lost Time is 1, cards raise Perusing the Stacks. When Perusing the Stacks reaches 40, the next card drawn will be (Apocrypha Found), a High Urgency card. Playing it sets In Search of Lost Time to 2, and now cards increase Finding the Centre instead.
Once you have 40 Finding the Centre, another High Urgency card is added to your deck, The Reading Room. This card lets you read the particular book determined by 
Apocrypha Sought: and claim the corresponding reward.
Afterwards, you are redirected to Winding back the Thread. Passing the challenge (or failing three times) will let you return to where you entered. Carrying 
Library Keys increases the likelyhood of being redirected to Overdue and taking some 
Wounds.
Items and Qualities[edit]
The Stacks introduced many new items and qualities. Here's a brief overview:
The activity is separated in two stages, indicated by In Search of Lost Time. During the first stage, you set out to find the book you want to read. During the second stage, you search for a reading room, where you can safely read the book.
Perusing the Stacks and Finding the Centre are the progress qualities. Perusing the Stacks is active during the first stage, while Finding the Centre is active during the second stage. You can only raise them during their respective stages. Once you hit 40 on either quality, you'll start drawing the card that will bring the stage to a close.
Noises in the Library is a menace specific to this location. It's reset when you exit the Stacks. For more information, see the respective section below.
There are several other items that help you navigate the library:
Route Traced through the Library unlocks some options that give good progress.
Fragmentary Ontology is mainly used to increase 
Chthonosophy. It can also be used on some cards to gain Routes and progress.- Library Keys can be used for progress on A Locked Gate or A Librarian's Office, and are also required to collect the Chained Volume.
Disposition of the Cardinal is gained by befriending and feeding the local library cat and acts like a get-out-of-jail-free-card on the menace-related card A Gaoler-Librarian.
Note that these items are persistent between your visits to the Stacks! For example, a library key gained during one run can be used in the next if it hasn't been expended.
Tantalising Possibilities are an economy item that can regularly be found in the Stacks. It sells for 
2 (or 
0.10 at the Bazaar). Some options yield 50 Tantalising Possibilities, resulting in a resell value of 100 or 5.
When exiting the Stacks, you'll have to contend with Unwound Thread, which you'll have to decrease to 0 to exit it. Furthermore, there is the quality 
Anathema Unchained. This one increases upon collecting the book from A Chained Volume, and decreases by 1 upon every completion of the carousel. When it hits 0, you'll be able to find your book again.
The Hour in the Library: (HITL) affects cards in the opportunity deck. It acts like a clock with five "hours".
- HITL is set when entering the stacks, depending on your chosen route.
- The quality is increased by 1 when you complete the first stage, via Claim the book or Unchain it. If it was already at 5, it will instead roll over to 1.
- HITL is also advanced when leaving the reading room. This has no mechanical impact.
- HITL is cleared when you leave The Stacks.
HITL affects the following cards:
- At 1 or 2, A Flowering Gallery can be drawn.
- At 3, 4, or 5 A Black Gallery can be drawn.
- At 3 or 4, Follow a borehole through the back of a bookcase can be played from A Stone Gallery.
- At 1, 2, 3, or 5, Stop and look through can be played from A Glimpse through a Window.
Finally, An Interloper in the Library records how often you've been to the Stacks. Apocrypha Sought governs which book you're looking for, while 
Wandering the Stacks with tracks which NPC you're exploring the Stacks with. 
Dead Letter tracks from where you entered the Stacks.
Training Chthonosophy[edit]
In addition to reading books, you can train Chthonosophy while in the Stacks. This is a rather involved process that can be boiled down to:
- Collect Fragmentary Ontologies from various cards. Current sources include:
- A Flowering Gallery (Eat the fruit of knowledge, a Kataleptic Toxicology 12 narrow check which gives 2 Ontologies on success)
- An Index (Try to understand the organisation of the library, a Chthonosophy 7 narrow check which gives 1-3 Ontologies on success and 1 Ontology on failure)
- A Librarian's Office (Pick through the drawers, a 90% Luck check which can reward various items, including an Ontology)
- A Tea Room? (Try to make sense of what you've seen, a check based upon your number of Ontologies, which rewards one Ontology on failure.)
- Spend Ontologies on specific cards for Chthonosophy CP.
- A Tea Room? (Try to make sense of what you've seen, a check based upon your number of Ontologies. Rewards +1 CP on success in exchange for one Ontology.)
- A God's Eye View (Try to hold it all in your mind at once, a 40% Luck check. Rewards +2 CP on success in exchange for six Ontologies.)
A Chained Octavo[edit]
To get A Chained Octavo ( 1001 Apocrypha Sought:), it requires:
- Apocrypha Sought: 201-1000
- An Interloper in the Library 4
- In Search of Lost Time exactly 1
A True Denizen of the Neath (aka Ambition completion)- Anathema Unchained exactly 0
If you haven't read A Chained Octavo before, and meet the above requirements, the card A Chained Volume (First time) will appear in your deck. If you have done this before, a version with Rare Frequency can be drawn instead.
Playing Unchain it on this card (consuming a Library Key) will set Apocrypha Sought: to 1001, set In Search of Lost Time to 2, and give 10 Anathema Unchained. This quality decreases by 1 each time you complete this activity. This cooldown which prevents players from getting A Chained Octavo too often.
Note that because you obtain the octavo to read instead of the book you originally set out for, the actions spent on this round in the Stacks can be significantly lessened as you skip out on any remaining Perusing the Stacks progress.
Cards[edit]
Standard Cards[edit]
Beneficial Cards[edit]
Most of these cards appear with a violet border.
| Card | Option | Cost | Challenge | Success | Failure | |
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The Grey Cardinal | Offer the cardinal a furry lunch |  1x
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5 Progress 1x
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| Offer the cardinal a tin of something fishy |  1x
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5 Progress 1-2x
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| Engage the Cardinal in conversation |  
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1x 50x
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40x
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A Glimpse through a Window | Stop and look through (not during An Hour of Darkness)
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50x
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| Move on quickly | 5 Progress | |||||
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A Tea Room? | Take a moment to regroup |  -? CP -? CP -? CP
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| Consult your maps of the library | 1-3x
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10 Progress | 5 Progress | ||
| Try to make sense of what you've seen | 1x
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+1 CP 50x
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1x
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Advancing through the stages[edit]
These cards begin to appear once the progress quality of your stage hits 40. Playing them will move In Search of Lost Time forward. They appear with a golden or violet border.
| Card | Apocrypha Sought:
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Description | |
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Symmetries of the Deep Zee and Sky | 101 | Only during the Firmament storyline
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| Index of Banned Works, 1899 Edition | 201 | ||
| Annal of Lost Stars | 202 | ||
| Le Précipice de la Tombée | 203 | ||
| A Codex of Unreal Places | 204 | FATE
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| The Book of Proper Speech | 205 | ||
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A Chained Volume | 200-1001 | See A Chained Octavo for details. |
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The Reading Room | The card that closes the second stage. Open your book and see where it leads you. | |
The Clamorous Cartographer's Cards FATE[edit]
These Cards only appear with the FATE-locked Clamorous Cartographer.
| Card | Option | Cost | Challenge | Success | Failure | |
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Needs |
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1x
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5 Progress
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3x
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5x
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Needs |
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1-3x
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1 Progress +2 CP
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3x
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5-15 Progress
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Menaces[edit]
You cannot accumulate more than 7 Wounds or Nightmares from playing cards in the Stacks. However, there is a different menace unique to the area: Noises in the Library. If this hits 8, a storylet will autofire, setting your Wounds to 8 and sending you to the Boatman.
Most Noises gains come from failing checks. However, those looking to collect a 
Glimpse of Anathema should be particularly cautious, as the option to unchain the book is locked out at 7 Noises, and the action raises Noises by 6 CP.
Leaving the Stacks will reset Noises to 0. It can also be reduced with an option on A Tea Room?, as well as with a Shadowy 220 broad check on A Terrible Shushing.
(Note: it can be advantageous to have at least one point of Noises, as it will unlock A Gaoler-Librarian, a card that has a checkless, menace-free progress option as long as you have Disposition of the Cardinal to spare.)
Reward Overview[edit]
This activity has several different outcomes. Different values of Apocrypha Sought: let you choose from either one or two different rewards.
Not all options pay the same. The Index and the Annal's first option net approximately 116. However, the Annal's second option (Return with the lighthouse-keeper's ledgers and charts) only gives 100. Le Précipice gives a lower reward in both options, 91 for helping others and 83.5 for looting, due to the unknown value of one of the items. A Chained Volume ( 1001 Apocrypha Sought:) is much more profitable, rewarding an item worth 312.5, but can only be obtained at most every 10th run.
Depending on your choices in the library, you might also have acquired a respectable amount of Tantalising Possibilities.
( * Items can be sold for Stuiver)
Analysis[edit]
Disclaimer[edit]
Although theoretical maximum EPA from The Stacks is extremely high, take such calculations with a grain of salt. It is important to remember that there are multiple confounding factors that mean these figures are more theoretical than practical:
- The Stacks is a difficult and RNG-heavy activity. It is highly unlikely you will draw the ideal card for a scenario, or succeed every check, or get optimal outcomes on success.
- Much of the payout is in Stuivers. As of Chapter 2 of Firmament, there is no way to convert Stuivers into Echoes without taking a significant loss. Even as future chapters add more conversion options, optimal strategies may still produce a mix of unconverted currencies. The exception to this are the rewards from the Fate-locked Apocrypha Sought: 204, which can all be sold for echoes at the Bazaar.
- Carapaces must be sold for Stuivers or cashed out through the Bone Market. Due to their limb count, they are only suitable for making spiders, insects, or fish.
- The most profitable reward, Glimpses of Anathema, is from a rare card that is only available at most once every ten runs.
Average Run[edit]
Selecting a book on A Card Catalogue will always cost 1 action, claiming it costs 1 action, and reading it will cost 2 actions, regardless of book. After the book is read, getting back takes 2 actions minimum, or up to 4 actions if you fail the combined 
Shadowy and Inerrant challenge twice.
If you manage to consistently play cards that grant 5 progress, each stage will take 8 actions and you will complete the carousel in 22 actions. With Apocrypha Sought: 201, this is 5.27 EPA (116 E / 22 A). On runs with Apocrypha Sought: 1001, the higher payout and b Perusing the Stacks, this is 22.32 EPA (312.5 E / 14 A).
Certain card combinations can exceed 5 progress per action. A Tea Room? is very powerful, Routes Traced through the Library, exchanging one Route for 10 progress. 5+ Routes guarantees a success, while failure exchanges one Route for 5 progress.
There are many sources of Routes, with higher difficulty options having better rewards. A Dead End? has the best source, giving 2 Routes and 50 x Tantalising Possibility. A Map Room also gives 50 x Tantalising Possibility, but averages 1.5 Routes in exchange for an easier check. An Index averages 2 Routes with an easier Watchful and Inerrant check. A Discarded Ladder has the easiest check and gives 1.5 Routes on average.
Holding 6+ Routes unlocks the The Shape of the Labyrinth card during the second phase. This card has an expensive source of 10 progress, and a way to exchange Fragmentary Ontologies for progress.
As Fragmentary Ontologies accumulate from A Librarian's Office, they can be spent via Situate yourself within the greater whole, Reject the significance of shape, Course correct, or on A God's Eye View. The latter has a option with a guaranteed 15 progress (the only other requirement is 5 Chthonosophy), which makes it ideal for players who struggle at the challenges in the Stacks.
The Tea Room + Dead End combo produces 20 progress and 5 echoes of items for three actions. If you managed to play only these cards, a full run would average 18 actions and produce an additional 20 echoes of value beyond the reward for reading the book.
Library Keys can be spent for 15 progress via A Locked Gate and Unlock the cart, but are difficult to obtain consistently. Not only does stealing keys from the Librarians have a difficult check, it has a Noises requirement. There are only two ways to gain Noises without wasting an action not making progress: intentionally failing to descend from A Dead End?, or drawing A Map Room and consulting the Cartographer (FATE-locked). If your stats are high enough to risk stealing keys, it's worth using one of these to gain Noises early in each run.
Monte Carlo simulations made by Discord user zahmahkibo estimate that, over thousands of runs, expeditions to Le Précipice de la Tombée have an EPA of about 6.3, counting anticandles as 2.5 Echoes. However, this assumes that anticandles will eventually be sellable. Using the Clamorous Cartographer's book adds a couple of mediocre cards to the deck, lowering the EPA to 6.1, but only gives resources that are sellable for echoes. This simulation can be downloaded here for those sufficiently skilled with Python: Monte Carlo Simulations for The Stacks
The Clamorous Cartographer[edit]
The Clamorous Cartographer expansion adds two standard frequency cards, three options on existing cards, and one book. For one action, these can be toggled on or off from Index, Indweller, Indicatrix.
There are two standout options on the cards. One converts 3 Route Traced through the Library into 5 Fragmentary Ontology. This is a strong source of Ontologies. On the other card, 3 Routes are exchanged for 5, 10, or 15 progress. While this does average only 3.33 progress per Route, it does remain a viable option if one has plenty of Routes.
The Cartographer adds an option to A Dead End? that gives 10 
Tempestuous Tales. Unless you have low stats, this isn't the best option on the card - you miss out on the hand clearing of Tie a rope to the railing and descend and the profit of Take advantage of the vantage point.
A useful option is added to A Map Room that always gives 5 progress and +2 CP Noises in the Library. This is the best way to add A Gaoler-Librarian to your deck while still gaining significant progress. It is also the only option on the card that gives progress.
Quiet the Cartographer is a very useful option on A Terrible Shushing. It always gives the greatest decrease of Noises in the Library.
Apocrypha Sought: 204, from Look for a copy of A Codex of Unreal Places, stands out amongst the options because all of its rewards can be sold at the Bazaar, no conversions needed. The first time you get the book, there will be different text and an option that gives 50 Tantalising Possibilities.
Theoretical maximum profit[edit]
Because exploring The Stacks is a complex and RNG-heavy activity, profitability varies substantially between individual runs. Simulations let us approximate an average run's profit, but even this is inaccurate, as the expected value depends on each player's stats. We can get a more complete picture by examining the theoretical best-case scenario.
An optimal cycle of The Stacks is ten runs long, one seeking the Chained Octavo for a Glimpse of Anathema and the rest seeking any 116 Apocrypha. We assume the player has high enough stats for 100% success on any stat-based challenge. The player ends the cycle with net zero change in Stacks resources.
- Every run spends six actions at fixed points: one to choose a goal, one to find or unchain the book, two to read it, and two to leave.
- Each progress phase takes six actions each. Normal runs have two progress phases, while Anathema runs skip the first progress phase (we assume that A Chained Volume is drawn and played immediately).
- Draw A Dead End? and play Take advantage of the vantage point twice for 4 x Route Traced through the Library and 100 x Tantalising Possibility.
- Draw A Tea Room? and play Consult your maps of the library four times for 40 progress.
- Draw A Dead End? and play Take advantage of the vantage point twice for
- Anathema runs require a Library Key, so one progress phase must be spent acquiring a key.
- Gain Noises alongside 5 progress, either by drawing A Dead End? and using a
Woesel to fail the descent, or drawing A Map Room to Get a lead from the Cartographer (FATE-locked). - Draw A Gaoler-Librarian and steal a key twice.
- Draw A Locked Gate or A Librarian's Office and spend one key for 15 progress.
- Draw A Dead End? and play Take advantage of the vantage point for 2 x Route Traced through the Library and 50 x Tantalising Possibility.
- Draw A Tea Room? and play Consult your maps of the library twice for 20 progress.
- Gain Noises alongside 5 progress, either by drawing A Dead End? and using a
This ten-run cycle produces 1541.5 in 175 actions, for 8.81 EPA.
Note this does not consider any potential uses of rewards for additional profit, such as using 
Glim-Encrusted Carapaces in the Bone Market. It also doesn't account for gaining multiple keys at once for multiple Anathema runs, minimizing the less-efficient key-gathering progress phases. This would approach a ceiling of 8.84 EPA, but is impossible to reach as hoarding keys guarantees a Librarian ambush on escape for an extra action cost.
- ↑ 101.2 if sold at The Midnight Market
