That's no Moon
Living infested planet where you must fight against oceans of formidable beasts, hides a powerful new resource and unimaginable technologies. Land in one of its tendrils and make way to the planet core. Ruins of an advanced civilization are present and seem necessary to tame this place, with exotic technologies to process water rich minerals into most diverse elements and gargantuan machines. Completely safe to add or remove mid save.
Mods introducing new content into the game.
That's no Moon