Colonies

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Colonies are the basic economic unit of Galactic Civilizations III, which are basically comparable to a city in a traditional land-based 4X strategy title.

Basics

Each colony is a single planet. It has a certain number of tiles available to build improvements on, which is represented by its Class rating. It may have a special bonus associated with it, like a Shielded World's additional resistance to invasion, or may have one or more Trade Resources present. Individual tiles may also have tile bonuses that increase the level of improvements built on and adjacent to them. Each colony can sponsor one shipyard to construct starships, and simultaneously build one social improvement or project.

Planetary Class

Every planet is assigned a class, from 0 (uninhabitable) to 26 (paradise). The number designates how many tiles are available for housing improvements. It also serves as a cap for the planet's population. Terraforming (see below) can raise a planet's class.

Improvements

Improvements are buildings that increase the output or defense of the colony in various ways. Some, like Factories, multiply the manufacturing output by a certain percentage. Others, like Meditation Centers, don't increase output directly, but boost Approval, which then increases growth and productivity. Military improvements like the Champions Temple make the planet harder to conquer by increasing its resistance to invasion.

Special Improvements

Some improvements require a galactic resource to construct and will consume that resource until they're demolished. These improvements have higher payoff, however. For example, the Durantium Refinery gives a +2 manufacturing adjacency bonus, as well as providing one raw unit of manufacturing itself.

Wondrous Improvements

One-per-empire improvements like the Hyperion Shipyard are expensive, but give unique bonuses like giving all ships created by the shipyard this planet sponsors a boost to hit points.

Capitals

Colony capitals cannot be moved or demolished, but provide a +1 adjacency bonus to all types of improvements. In the Crusade expansion they can be upgraded to support additional population and increased morale.

Terraforming

Certain technologies allow special Terraforming improvements. These potentially allow you to unlock new tiles for development, assuming there is land available for such development.

Invasion Damage

Tiles and improvements can be destroyed during planetary invasions, whether or not the invasion is successful. The likelihood of this happening depends on what invasion tactics that are used by the aggressor.

Food

Population can be expanded past the initial colony cap by building city improvements. Carbon based life forms require food to build cities. (Silicon based life forms need promethion instead, synthetics don't need cities at all). Food can be produced by building Farms and their upgrades. Food is a global resource; food produced on a planet goes into a global pool and can be used to build a city on any other planet. In the Crusade (and Intrigue) expansions, Arable Land tiles provide +1 food each and farms can only be built on those tiles. Each farm upgrade provides additional food. Improvements such as Food Distribution can raise food by a percentage multiplier and increase the yield of farms through adjacency bonuses. There is an exception to building only on Arable Land - Aquatic civilizations can build Hydroponic Farms on any tile.

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