Non-Living Universe

Core setting: Human civilization has become a distant past tense, perhaps a "Great Nirvana", perhaps an active sublimation departure, leaving behind some legacy and a transformed solar system. Robot civilization - they call themselves "descendants" or "successors" - independently developed and prospered based on the seed AI and initial infrastructure left by humans, forming extremely diverse forms of existence. The core of the story will explore the interactions within this civilization, the meaning of its existence, and its evolution in the face of challenges from the depths of the universe or within itself.