Regions

This page mainly discusses the game mechanics for regions. For a list of all regions in Terra Invicta, as well as their initial stats, see Region List instead.

Regions are geographic areas that make up a nation.

The tab also includes information about the Boost and Mission Control resources that are based in each region.

The claims column lists other Nations that may annex a territory.

Events, combat, councilor activity location and the presence of launch facilities or other installations all occur in a particular region rather than nationwide.

Characteristics

Regions may have the following characteristics:

Characteristic	Icon	Effects
Capital Region		Councilor Missions targeting the nation as a whole or its control points will usually take place here. Conquering the capital of a nation in a War will trigger regime change and annexation of any Claimed territory by its enemies.
Colony Region		Gets only half of its fair share of the nation's GDP. Cannot have its own Armies.
Core Oil Region		Gets 125% of its fair share of the nation's GDP. Increases Monthly Pollution for its Nation. Increases the Economy Priority's effects on GDPPC and Inequality. Increases the Spoils Priority's effects on Sustainability and Inequality, but also increases the Money produced.
Core Mining Region		Gets 125% of its fair share of the nation's GDP. Increases the Economy Priority's effects on GDPPC and Inequality. Increases the Spoils Priority's effects on Sustainability and Inequality, but also increases the Money produced. Give +5% Build Army Priority and +5% Build Navy Priority
Core Economic Region		Gets 125% of its fair share of the nation's GDP. Increases the Economy Priority's effects on GDPPC. Give 0.1 Miltech to defending armies (including the region defense forces). Give 0.125 Miltech to armies whose factions have researched Urban Warfare Doctrine.
Rugged Region		Give 0.2 Miltech to defending armies (including the region defense forces). Give 0.125 Miltech to armies whose factions have researched Mountain Warfare Doctrine. Increase Annex Region operation duration by 25%. Increases Army travel duration to and from region. Increase defenses of non-Xenoflora Alien Assets in region against Army Assault operations. Halve the Daily Xenoflora Growth cap in region.
Ecologically Protected Region		Will not (directly) suffer economic loss from Climate Change. Will suffer only half the population growth penalty from extreme climate temperatures.
Ecologically Vulnerable Region		Will suffer twice the economic loss from Climate Change. Will suffer twice the population growth penalty from extreme climate temperatures.
Alien Activity		Indicates that some form of alien activity has been detected in this region. No real effects.
Fallout		Prevents certain region improvements. Reduces the Environment Priority's effect on Sustainability. -4% population growth penalty per layer of fallout.

Improving Regions

Improvement	Conditions	Nation Priority	Completions Needed
Set to Oil Region	Cannot be Core Economic Region or Core Mining Region. Cannot have Fallout. Marked as Oil Capable in the game template files.	Economy	500
Set to Core Mining Region	Cannot be Core Economic Region or Core Oil Region. Cannot have Fallout. Marked as Mining Capable in the game template files.		750
Set to Core Economic Region	Cannot be Colony Region. Cannot have Fallout. Has >500 Billion Region GDP		1200
Remove Colony Status	None	Welfare	1000
Remove one layer of Fallout	None	Environment	100

Note: If multiple regions are valid targets for an improvement type, the one with the highest Region GDP is usually improved first.

World Ocean Access

Some regions may allow armies in them to access the world oceans. The game template files include a variable for each region indicating when they allow such access:

• Some regions never allow armies in them to access the world oceans. These regions are typically inland regions.
• Some regions always allow armies in them to access the world oceans. These regions are typically island or coastal regions that are near the equator.
• Some regions only allow armies in them seasonal access to the world oceans. These regions are typically island or coastal regions that are near the poles.

In the case of seasonal access, regions in the northern hemisphere allow access only from April to September, whereas regions in the southern hemisphere allow access only from October to March.

Notably, if the temperature anomaly exceeds 1.9C, the Arctic Melt Accelerates event can trigger. This event causes every region that has seasonal world ocean access to gain permanent world ocean access.

Facilities

Facilities are constructed in a nation's regions following certain priorities and can be attacked via the Sabotage Facilities councilor mission, Assault Space Facility army mission, or orbital bombardment.

• Launch Complex produces Boost.
• Mission Control Facility produces Mission Control.
• Space Defense Array prevents Nuclear Weapons from being used in the region and will fire back if the region is being bombarded. It may also prevent alien ships in orbit from executing certain operations.

Alien Assets

Alien Assets in a targeted region and can be attacked via the Assault Alien Asset mission or destroyed by orbital bombardment. See Aliens for more details on the different types of Alien Assets.

Alien Life Forms

Alien Life Forms, or Xenoforming as it is sometimes called, is an alien asset created by one of the alien councilors' missions. It has negative effects population growth and grants bonuses to Servant and Alien activities in a nation. It passively grows over time and spreads to adjacent regions.

See Aliens#Alien_Xenoforming for more details.

Xenoflora Growth Levels	< 30	Between 30 and 75	> 75
Image

Region Damage

Whether deliberately or by accident, regions in Terra Invicta can be heavily damaged through the actions of the different factions, especially when they wage wars over the Earth.

Effects of Region Damage

Note: Region damage almost always has strength between 0 and 1. If anything attempts to apply region damage of negative strength, nothing happens.

Effects of an X Strength Non-Nuclear Attack on a Region (In Chronological Order)

Category	Conditions	Amount
Target Region GDP	None	X × (-7.5% to -12.5%)
Target Region Population	None	X × (-0.075% to -0.125%)
Target Nation Pollution Multiplier	None	X × (+0.0000075 to +0.0000125) × Region GDP / Nation GDP
Responsible Faction Commits Atrocities	Population killed >= 100k.	1 per 100k Population killed, capped between 1 and 20.
Target Nation Priorities	X >= 0.9	Multiply IP invested by (1 - X) for all priorities except Spoils , Unity , and Oppression .
	X < 0.9. An X × 500% roll passes. Target Region is not a Colony Region .	Multiply IP invested by (1 - X) for one random priority that is not Spoils or Unity .
	X < 0.9. An X × 500% roll passes. Target Region is a Colony Region .	Multiply IP invested by (1 - 0.5X) for one random priority that is not Spoils or Unity .
Target Boost Production	Target Nation is NOT Responsible Nation. X >= 0.75.	-100%
	An X × 100% roll passes.	X × -100%
Target Mission Control	Target Nation is NOT Responsible Nation. X >= 0.75.	-100%
	An X × 100% roll passes.	-1
Target Space Defenses	Target Nation is NOT Responsible Nation. X >= 0.75.	Destroy
	An X × 100% roll passes.	Destroy
Target Nation Funding	X < 0.75	-10% × X × Region GDP / Nation GDP
Health of Each Army in Target Region	Army is not Ally of Region Damager	X × -100%
Target Alien Xenoforming	Responsible Faction is not Aliens or The Servants	-X × Xenoflora Growth Levels

Note: An army is an ally of the region damager if any of the following are true:

• The army is owned by the responsible nation.
• The army is owned by an ally of the responsible nation.
• The army is owned by the responsible faction and not a Megafauna.

See Nuclear Warfare for the effects of a nuclear attack on the region.

Sources of Region Damage

These include but are not limited to:

Category	Conditions	Strength	Special Notes
Non-Megafauna Enemy Army	Each Day Fighting in Region	Max(1, 12 - Effective Miltech) / 50000 × (1 to 100)	Cannot cause damage to armies through this region damage.
Megafauna Enemy Army	Each Day Fighting in Region	Miltech × Health % / 2000	Cannot cause damage to armies through this region damage.
Non-Megafauna Army	Each Day Fighting Another Army in Region	(10 - Effective Miltech) / 50000 × (1 to 3)	Cannot cause damage to armies through this region damage.
Megafauna Army	Each Day Fighting Another Army in Region	(10 - Effective Miltech) / 500 × (1 to 3)	Cannot cause damage to armies through this region damage.
Revolution	Region is the Capital	0 to 0.5	None
	Region is not the Capital	0 to 0.25	None
SPOILERS INSIDE!   Alien Nation Overthrown	Region is the Capital	0 to 0.5	Cannot cause damage to armies through this region damage.
	Region is not the Capital	0 to 0.25	Cannot cause damage to armies through this region damage.
Bombardment of Armies	Each Kinetic Attack has 20% Chance	Attack Damage / 500000, capped at 0.001	None
Bombardment of Regions	Each Attack	Attack Damage / 10000, capped at 0.05	Cannot cause damage to armies through this region damage.
Raze Region Army Operation	On Completion	Army Home Nation's Miltech / 10 × Army Health %	Automatically passes rolls against Boost , Mission Control , and Space Defense Facilities.
SPOILERS INSIDE!   Dominate Nation Mission	Normal Failure	0.4	Automatically passes rolls against Boost , Mission Control , and Space Defense Facilities.
	Critical Failure	0.9	Automatically passes rolls against Boost , Mission Control , and Space Defense Facilities.
SPOILERS INSIDE!   Terrorize Region Mission	None	0.01 to 0.07	None