Buildings

Buildings must be placed within owned territory, which is projected around the Citadel and Beacons. Pieces can be built anywhere.

Each building has an Oxygen maintenance cost that depends on the game difficulty.

A buildings can only be placed where it has enough Support from below. If sections providing Support are destroyed or removed the supported building may collapse. When time is paused a building won't collapse without Support. Buildings left without Support will be highlighted red.

You can recycle placed buildings to recover their resources pressing the recycle button below the build menu and then clicking on the buildings you want recycled.

Citadel

The Citadel

Every settlement will begin with a Citadel, which produces 180 Oxygen, stores resources and projects territory around it. It produces 10 Military Capacity and can be upgraded to produce more. It also comes with two towers where buildings may be placed, ideally Air Filters. All buildings need a path to the Citadel to function and will shut down if pieces facilitating this are destroyed or recycled. If the Citadel is destroyed the mission is lost.

The Citadel has a health of 400, which is increased to 650 with the Reinforced Stonework skill from the Book of Insight.

The Citadel produces 10 Citizens on Story difficulty, 8 Citizens on Easy/Normal/Hard difficulty and 6 Citizens on Extreme difficulty.

With the Headquarters Defense skill from the Book of Insight the Citadel gains an ability to damage all horrors around it. With the Mistleap skill from the Book of Insight the Citadel gains an ability to teleport all units in the selected area to the Citadel.

Resource Gathering

Resource Gathering buildings are used to produce resources.

Raw Materials

Raw Materials buildings produce workers who carry materials from the resource gathering building to the nearest Warehouse or Citadel. The shorter the distance the faster resources will be gathered. The buildings come in two levels and can be upgraded for the cost difference once the required Prosperity is reached.

Building	Max. Production	Cost	Build Time	Prosperity Level
Sawmill	15 Wood/min	75 Oxygen	35 Seconds	I
Quarry	15 Stone/min 15 Minerals/min	90 Oxygen 75 Wood 3 Citizens	35 Seconds	I
Warehouse	Increases the storage limit of Wood, Stone and Minerals Drop-off point for resources Allows research of resource gathering improvements	405 Oxygen 120 Wood 20 Minerals 14 Citizens	63 Seconds	I
Master Sawmill	15 Wood/min	310 Oxygen 30 Minerals	35 Seconds	III
Master Quarry	15 Stone/min 15 Minerals/min	395 Oxygen 140 Wood 18 Minerals 3 Citizens	35 Seconds	III
Master Warehouse	Increases the storage limit of Wood, Stone and Minerals Drop-off point for resources Allows research of resource gathering improvements	540 Oxygen 225 Wood 25 Minerals 14 Citizens	63 Seconds	IV

Air Filtering

Air Filtering buildings produce Oxygen and do not have maintenance costs. They must be placed high to function.

Building	Max. Production	Cost	Build Time	Prosperity Level
Air Filter	180 Oxygen/min	48 Wood 2 Citizens	35 Seconds	I
Bulk Air Filter	270 Oxygen/min	100 Wood 10 Minerals 2 Citizens	35 Seconds	III
Air Silo	Increases Oxygen storage limit Allows Oxygen research	105 Wood 25 Minerals 270 Oxygen 10 Citizens 2 Mistfuel	49 Seconds	III

Mist Condensing

The Mist Condenser is unlocked at Prosperity level III, produces up to 10 Mistfuel and requires Mist. Cost: 200 Oxygen, 180 Wood, 20 Minerals, 6 Citizens. Build Time: 35 Seconds.

City Buildings

City Growth

Building	Effect	Cost	Build Time	Prosperity Level
Beacon	Expands the settlement's territory in a large radius Favored target of horrors	24 Wood 100 Oxygen	28 Seconds	I
Shack	Gives 5 Citizens on Story difficulty Gives 4 Citizens on Easy/Normal/Hard difficulty Gives 3 Citizens on Extreme difficulty Comes with a support area on top	30 Wood	35 Seconds	I
Air Trader	Enables buying Wood and Stone with Oxygen	100 Wood 340 Oxygen 15 Minerals 7 Citizens	56 Seconds	II
Masonry Guild	Allows researching construction improvements	195 Wood 500 Oxygen 25 Minerals 18 Citizens	49 Seconds	II
Homestead	Gives 9 Citizens on Story difficulty Gives 8 Citizens on Easy/Normal/Hard difficulty Gives 7 Citizens on Extreme difficulty Comes with a support area on top Can also be upgraded from Shack for the cost difference	110 Wood 90 Oxygen 15 Minerals	35 Seconds	III

Military Growth

Military Growth are used to recruit and upgrade units.

Building	Trains and upgrades	Cost	Build Time	Prosperity Level
Barracks	Bowman Lobber Captor	225 Oxygen 120 Wood 10 Citizens	42 Seconds	I
Bomber's Workshop	Cannoneer Ballista	680 Oxygen 240 Wood 40 Minerals 18 Citizens 2 Mistfuel	56 Seconds	III
Elite's Quarters	Hunter	920 Oxygen 300 Wood 60 Minerals 22 Citizens 8 Mistfuel	63 Seconds	IV

Building Supplements

Building supplements provide bonuses to buildings that are adjacent or underneath them. All of them take 18 seconds to build.

Building Supplement	Effects	Cost	Prosperity Level
Home Extension	Adjacent Shacks and Homesteads gain +1 Citizen Has a 2x2 construction area on top.	10 Wood 5 Minerals	II
Airtight Insulation	Adjacent Shacks and Homesteads gain -20% Oxygen maintenance	30 Wood 8 Minerals	III
Autonomous Pump	Adjacent Air Filters and Bulk Air Filters gain -1 Citizen cost	15 Wood 8 Minerals	III
Intake Duct	Adjacent Air Filters produce +54 more Oxygen Adjacent Bulk Air Filters produce +81 more Oxygen	30 Wood 14 Minerals	IV

Pieces

A gap made traversable with wood pieces

Stone Bricks changing appearance as Toughness increases

Pieces are constructed instantly. If you hold and drag with left mouse button pressed you can build multiple pieces in a straight line.

Pieces made primarily of Stone have a Toughness rating. If there are enough other pieces made primarily of stone underneath or above them their Toughness will upgrade, visibly changing the appearance of the entire column of pieces. Pieces gain x10 health if there are 3 pieces above/below them and x25 health if there are 6 pieces above/below them. Pieces that are in danger of breaking will glow red.

Wood Pieces are cheap and require less Support but their health is minimal. Their purpose is in aiding travel, either across caps or to reach the top of Stone Pieces.

Stone Pieces have more health and gain Toughness but require more Support. Stone Pieces do not require any level of Prosperity to be constructed but some must be unlocked with skills from the Book of Insight.

Advanced Pieces

Doors

Doors are available from the start and allow units to pass through walls. They allow other buildings to be constructed above them.

Door	Effect	Health	Cost
Door	Allows only human units to pass	6	15 Stone 24 Wood 4 Minerals
Double Door	Allows only human units to pass	8	25 Stone 36 Wood 6 Minerals
Arch Doorway (1x1)	Allows all units to pass	2	6 Stone
Arch Doorway (1x2)	Allows all units to pass	3	12 Stone

Windows

Windows are unlocked at Prosperity level II and boost the range of units behind it. They allow other buildings to be constructed above them.

Window	Health	Cost
Window	2	8 Stone
Wide Window	3	12 Stone
Corner Window	2	8 Stone

Roofs

Roofs are unlocked starting with chapter 8 when rain becomes present and will give units shelter from the rain. All of them cost 1 Wood.

Tactical Pieces

General Boosts

General Boosts provide benefits to nearby defenses or units next to them.

Tactical Piece	Effect	Health	Cost	Prosperity Level
Merlon	Boosts the range of any unit behind it Upgrades the Toughness of stone pieces below it	Scales with wall	6 Stone	I
Merlon (interior corner)	Boosts the range of any unit behind it Upgrades the Toughness of stone pieces below it	Scales with wall	15 Stone	I
Merlon (exterior corner)	Boosts the range of any unit behind it Upgrades the Toughness of stone pieces below it	Scales with wall	6 Stone	I
Banner	Increases attack damage of adjacent units by 25%.	1	12 Stone 10 Minerals	I
Tactician's Nook	Reduces the cooldown of special skills Must be placed on a wall	Scales with wall	25 Stone 25 Minerals 2 Mistfuel	IV
Grand Banner	Increases attack damage of adjacent units by 50%.	1	12 Stone 10 Minerals	IV

Traps

Traps can be set up to damage approaching horrors but lose health in the process. Unlike other buildings recycling them does not refund resources.

Trap	Effect	Health	Cost	Prosperity Level
Spikes	Deals damage to any horror walking through it	30	15 Wood	I
Reinforced Spikes	Deals high damage to any horror walking through it	60	30 Wood 20 Oxygen 2 Minerals	III
Decoy	Attracts nearby horrors and explodes when destroyed, inflicting Burning on all attacking horrors	75	120 Wood 12 Minerals 2 Mistfuel	IV

Specialist Boosts

Specialist Boosts give adjacent units attack bonuses.

Specialist Boost	Effect	Cost	Prosperity Level
Fire Arrows	Bowman, Hunter and Partisan attacks cause damage over time Can be upgraded into Hell Arrows for the cost difference	15 Stone 25 Minerals	II
Throwing Poison	Lobber and Captor attacks cause horrors to inflict Slowed and Corroding on nearby horrors when killed Can be upgraded into Hell Poison for the cost difference	15 Stone 25 Minerals	II
Bomber's Spark	Cannoneer and Ballista attacks cause horrors to damage nearby horrors when killed Can be upgraded into Hell Spark for the cost difference	18 Stone 30 Minerals 2 Mistfuel	III
Hell Arrows	Bowman, Hunter and Partisan attacks cause damage over time Can also be upgraded from Fire Arrows for the cost difference	60 Stone 45 Minerals 90 Oxygen	IV
Hell Poison	Lobber and Captor attacks cause horrors to inflict Slowed and Corroding on nearby horrors when killed Can also be upgraded from Throwing Poison for the cost difference	75 Stone 50 Minerals 90 Oxygen	IV
Hell Spark	Cannoneer and Ballista attacks cause horrors to damage nearby horrors when killed Can also be upgraded from Bomber's Spark for the cost difference	81 Stone 58 Minerals 90 Oxygen 2 Mistfuel	IV