Pieces

Pieces are constructed instantly and nlike buildings pieces can be constructed anywhere. If you hold and drag with left mouse button pressed you can build multiple pieces in a straight line. A piece can only be placed where it has enough Support from below. If sections providing Support are destroyed or removed the supported pieces may collapse. When time is paused a piece won't collapse without Support and will be highlighted red. Pieces that are in danger of breaking will glow red as well.

You can recycle placed pieces by pressing the recycle button below the build menu and then clicking on the buildings you want recycled.

Pieces may be placed in two ways depending on the current mission.

• On Skirmish, Endless, Sandbox and Campaign city building missions pieces are constructed with resources like buildings.
• On campaign expedition and tower defense missions pieces must be obtained from caches on the map and may only be built in a limited number.

Toughness

Stone Pieces changing appearance as their Toughness increases

Pieces made primarily of Stone have a Toughness rating. If there are enough pieces made primarily of stone underneath or above them the Toughness of the column will upgrade, giving it a massive increase in health and visibly changing its appearance. The health bonus can be increased further with certain improvements at the Masonry Guild.

The health multiplier provided by each Toughness rating depends on the game difficulty.

Height	Health
	Story	Easy	Medium	Hard-Extreme
1-3	1	1	1	1
4-6	25	15	10	6
7-12	60	38	25	18
13+	120	76	50	36

Wood and Stone Pieces

A gap made traversable with wood pieces

Wood Pieces 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. Wood Pieces do not require any level of Prosperity to be constructed but some must be unlocked with skills from the Book of Insight.

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 only available on maps that have rain and will give units shelter from its debuff. All of them cost 1 Wood.

Lanterns

Lanterns are only available in Sandbox and Endless modes and in the latter need to be unlocked with points. They light up the fog of war in an area around them.

Bridges

Bridges are only available in Sandbox and Endless modes and in the latter need to be unlocked with points. They allow gaps to be crossed easily but units cannot be stationed on them.

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 units' special skills by 20%. 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 and do not recover it outside combat. Unlike other buildings recycling them does not refund resources. Their health can be improved at the Masonry Guild.

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. More compact versions can be unlocked via the Book of Insight.

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

Mounted Specialist Boosts

Mounted Specialist Boosts can only be built after purchasing the Advanced Stone Pieces skill in the Book of Insight. They are similar to the basic Specialist Boosts but cheaper and more compact.

Specialist Boost	Effect	Cost	Prosperity Level
Mounted Fire Arrows	Bowman, Hunter and Partisan attacks cause damage over time Can be upgraded into Hell Arrows for the cost difference	8 Stone 10 Minerals	II
Mounted 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	8 Stone 10 Minerals	II
Mounted Hell Arrows	Bowman, Hunter and Partisan attacks cause damage over time Can also be upgraded from Fire Arrows for the cost difference	31 Stone 23 Minerals 45 Oxygen	IV
Mounted 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	39 Stone 25 Minerals 45 Oxygen	IV