Mundus Virdi

One planet further out than Underhill, Mundus was named as a joking reference to an old Earth Island. Largely covered in ice, with the occasional patch of tundra, this planet was largely ignored by the original settlers of the system. After the last bombs of the Gene Wars went off and the survivors got a good look at the destruction, some turned their attention to the icy planet as a place of refuge, free of the taint of the bombs and the failed colony. These newly altered people were mostly remnants of the Neutral and Constitution camps, those who'd either already been altered to deal with Underhill, or who had held out against alteration. Most lived outside the safe zones once delineated by the Lay Lines, often high in the mountains.

Already used to snow and cold, their bodies adapted even further, some to the extent that the environs of all but the most extreme corners of Underhill were too warm for them to survive in. Petitioning the leaders of the Changed, as they now called themselves, the Cold-Folk asked that instead of being taken back to the Sol system, a Way might be made for them to get to Mundus instead. After a great deal of haggling and political maneuvering, the request was granted. They, along with the Sunkissed, were all that was left of the original colonists in the system for so long they almost forgot that there had been anyone else.

On the return of the Changed, over a millennia later, war was only averted because the Cold-Folk and the Sunkissed did not want Underhill, not even after the ravages of war were mostly faded. Now the three planets coexist in an uneasy peace, embassies from each quartered in the parts of the world most habitable to their people.