The most expensive and potent colony upgrade, the Galactic Capital tool triples the size and resourcing capacity of every city on the player's home planet, and quadruples the size of their original city. The tool can only be used on the player's homeworld, but offsets this limitation with no pirate raids within and twenty-five-parsec radius and a radically reduced likelihood of attacks by alien empires within this area. The planet will sustain five Heavy Fleets and ten Strike Fleets as well as provide five extra trading deal opportunities.