Is a space station intended to house living organisms such as humans, Creatures, and Plants. They are incredible feats of human engineering, kilometers-wide mobile space stations housing vast vaults of genetic information, cloning devices, and terraforming technology. In their dormant state, they wait in Earth orbit, simulating a diverse ecosystem by controlling onboard climate and animal populations. The dome that protects this false ecosystem from the void of space also doubles as an artificial horizon, masking the station's true nature with a blue sky and an artificial day/night cycle. Humans are deterred from reaching the edge of this artificial horizon by methods that look like natural boundaries. For an unknown period of time, the ARKs awaited an activation signal from Earth. The stations are programmed to perform a controlled descent in response to this signal, touching down on the planet's surface. Each station is a giant seed built to bloom over the Earth's wasteland, its terraforming systems sweeping away the Element infestation. All of this is triggered by an order called the Reseed Protocol that calls the ARKs to return back to Earth's surface. However, the Reseed Protocol is blocked by another piece of criteria: the Element Toxicity Rating.