Rho Tasralas II
A once-habitable planet of the Rho Tasralas System.
Rho Tasralas II only had a medium scale population of about 2 billion as well as a number of large cities. With the construction of Dyson Sphere Alpha, this planet would be made uninhabitable. Instead of evicting those that live on the planet, the Hyperion Federation decided to build underground complexes designed to somewhat mimic conditions of the surface to give its people a comparatively high morale (compared to other underground cities). They did this through the addition of a large light mounted on tracks on the large hollow sphere they dug out. Most life on the world depends on this light. All of the planets population moved underground.
Dyson Sphere Alpha was being constructed several years after everyone was confirmed to be underground. Slowly, the light of the 'true' sun began to dim, leading to the destruction of all surface life - but all the species were preserved in the underground city complex. The surface turned into a barren wasteland, though one with many signs of civilization from the surface.
After the HEX Mainframe and Cypher Dominion started deploying Planetcraft against the HF much much later, they needed a new response to this terrifying super heavy starship. They conceptualized a type of Planetcraft of their own, demolishing all the ruins on the surface and replacing it with TGX Composite armour. The underground city complex was retrofitted to house equipment for a planetcraft of their own, and became one of the first. They use it defensively as they cannot travel between galaxies. After mounting a huge railgun to it and immense photon thrusters, it has been made fully operational as a planetcraft and capable of remaining habitable even when well outside the habitable radius as it is fully enclosed. The new planetcraft would go on to serve many battles and make its cost significantly.
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