A city improvement obtained from the Temple of the Earth's Core technology, which is unlocked by completing Chapter 8 of each faction's respective faction quest. Constructing the Temple of the Earth's Core in a city will trigger the Wonder Victory upon completion, but provides no other bonuses to the city. The Wonder Victory condition must be enabled in the game's settings to be able to build the Temple of the Earth's Core.
It is a building and an energy source and a processing center; a fusion of Dust and matter that transcends any existing knowledge. By reactivating this long-dormant temple of the Concrete Endless, a faction can secure the future of their planet - and at the same time be humbled by the vast gulf of ignorance that separates them from the long-lost masters who first built this marvel.