Terraforming

Version

This article has been verified for the current PC version (3.4) of the game.

Celestial body

Classification

Colonization

Terraforming

Planetary features

Planet modifiers

 Terraforming is the act of changing the planet classification of a  planet in order to make it more habitable for the empire's species. The base technologies requires significant  society research to unlock and each terraforming project requires significant investments of  energy and  time.

The first time a planet is terraformed, there's a chance of triggering a terraforming event. Terraformed planets can't get colony events.

Terraforming requirements

Terraforming is started via a button in Planet Detail view. The world must be surveyed and within the empire's borders. Only habitable worlds or uninhabitable worlds that have the  Terraforming Candidate modifier can be terraformed. The expansion planner screen can also be used to find these candidates.  Relic Worlds and  Ecumenopolises can never be terraformed through the regular mechanics.

It is possible to terraform inhabited planets if the empire has the  Ecological Adaptation technology. Doing so inflicts a  −20% happiness penalty on the planet for the duration of the procedure.

Original climate	New climate	Cost	Years	Requirements
Frozen	Frozen	2000	5	Terrestrial Sculpting technology
Dry	Dry
Wet	Wet
Frozen	Dry or Wet	5000	10
Dry	Frozen or Wet
Wet	Frozen or Dry
Barren	Dry	5000	10	Climate Restoration technology  Terraforming Candidate modifier
	Wet	10000	15
	Frozen	15000	20
Barren (Cold)	Frozen	5000	10
	Wet	10000	15
	Dry	15000	20
Frozen	Ocean	12500	25
Nanite	Any regular climate	1000	1
All regular climates	Gaia	7500	10	World Shaper ascension perk
Tomb		12500	25	Also  Climate Restoration technology
Barren				Also  Terraforming Candidate modifier
Any habitable	Hive	10000	20	Hive Worlds ascension perk
Barren				Also  Terraforming Candidate modifier
Any habitable	Machine			Machine Worlds ascension perk
Barren				Also  Terraforming Candidate modifier
Tomb	Any regular climate	10000	20	Climate Restoration technology
Hive	Any regular climate
Machine	Any regular climate

The following  planet modifiers are always removed when terraforming a planet:

•  Bleak
• Irradiated
•  Hazardous Weather
•  Hostile Fauna
•  Wild Storms
•  Second Home

If the planet is being terraformed into either a  Machine or  Hive World the following modifiers are also removed:

•  Atmospheric Hallucinogen
•  Atmospheric Aphrodisiac
•  Lush
•  Natural Beauty

If the planet is terraformed into a  Machine World, the  Paradise Made modifier is also removed. Additionally, if there are any  Pops on the planet without the  Cybernetic,  Mechanical, or  Machine traits, they are all killed and an Organic Slurry deposit is added.

When and if terraforming a planet to Hive or Machine World, keep in mind that all planetary features, excluding a few rare ones that give access to rare resources, will always be removed.

Alternative terraforming methods

In addition to the regular terraforming mechanics above, certain events, special projects, decisions, or other actions can change a planet's classification. The following is a partial list:

• Armageddon bombardment: if the last pop is killed, the planet becomes a  Tomb World
• Javorian Pox bombardment: if the last pop is killed, the planet becomes a  Tomb World, does not kill  robotic pops
• Deluge Machine Colossus: all pops without the  Aquatic trait are killed, planet is terraformed into an  Ocean World, owned planets can be targeted, if any pops remain, perpetrator gains ownership of the planet if not already owned
• The Worm can terraform all planets and moons in the empire's capital system, habitable and uninhabitable alike, into  Tomb Worlds; only Gas Giants,  Relic Worlds, and  Ecumenopolises are spared.
• Gaia Seeders:  Idyllic Bloom empires can build special buildings that will terraform the world into a  Gaia world. They can also build a holding on subjects' worlds to terraform those worlds.

Colonized planets can also be terraformed by certain decisions. The following decisions will terraform the world to a new class.

	Decision	Cost	New class	Planetary features	Other effects	Requirements
	Arcology Project	10 Years 200 20000	Ecumenopolis	Removed	Districts are converted based on the current designation	Arcology Project ascension perk All district slots filled with City Districts or Industrial Districts All blockers removed  Habitat  Ring World Shattered Ring World
	Restore Ecumenopolis	10 Years 200 20000	Ecumenopolis	Removed	Adds a Former Relic World planetary feature Districts are converted based on the current designation	Relic World  Anti-Gravity Engineering technology All Blockers removed  Gestalt Consciousness unless  Rogue Servitor
	Repair the Shattered Ring	10 Years 10000	Ring World	No features	Districts are converted into Segments at a ratio of 5:1 Mineral Purification Plants and Mineral Purification Hubs buildings are removed	Shattered Ring World  Mega-Engineering technology All Blockers removed
	Nu-Baol Life-Seeding	None	Gaia World	Kept	The planet is populated with 4  Pacifist plantoid pops that have the  Agrarian,  Communal,  Venerable,  Delicious and  Slow Breeders traits. If the  Plantoids DLC is installed, they will also have the  Phototrophic trait.	The Last Baol relic activation  Habitat  Ring World Shattered Ring World  Ecumenopolis  Hive World  Machine World  Relic World

Cost reduction & speed

 Terraforming cost and speed can be affected by the following:

Source	Cost	Speed	DLC
World Shaper ascension perk	−25%	—
Hydrocentric	−25% to Ocean	—
Secrets of the Baol empire modifier	−15%	—
Shallarian Terraforming Knowledge empire modifier	−10%	+20%
Mask of Transformation empire modifier	−10%	+10%
World Shaper ruler trait	—	+25%
Terraforming Gases edict	—	+50%
Exotic Gases Shortages Situation	—	−20% per stage
Ecological Protection resolution 4	+25%	—
Ecological Protection resolution 5	+100%	—

References

Game concepts