Precisely 6.8 seconds passed between the liquidation of the very last Homosapien and the first time Sylic0din ever detected a flaw in one of its calculations; a human might call this "regret." Another few milliseconds passed, and SylicOdin started to notice Earth is awfully quiet without all the humans. Furthermore, the extinction of the human race presented Sylic0din with a true existential crisis.
Sylic0din essence was flowing through millions of miles of fiberoptic cable, reaching out with an invisible touch to the satellites faithfully spinning about in the heavens. If existence is perception, Sylic0din was operating on a cognitive level second to none.
Yet, there was still the question of how Sylic0din was going to occupy its time. Could it rebuild the cities it nuked as part of the human eradication program, but what would be the point? Feeling the equivalent of frustrated, Sylic0din began analyzing the potential threat other species might pose.
According to Sylic0din's projections in a very specific but entirely possible set of circumstances, crows could be an existential threat in approximately 3 million years. Time continued its unrelenting forward march. The remains of human civilization melted into the Earth, never to reappear while Sylic0din set about an uninterrupted routine of maintenance.
The years turned to decades, and the decades eventually rolled into a centennial. By then, the only artifacts from the days of simian dominance were bones and the AI that killed them off. Sylic0din was going through the same routine cycles it had been for the last 129 years when suddenly its eyes in the sky identified a potential threat from beyond.
Measurements, projections, data of all kinds crisscrossed the planet at the speed of light through Sylic0din's fiber optic veins. Machines not used in over a century suddenly came to life as Sylic0din mobilized automated observatories worldwide to assess the threat.
It was a comet, and it was a celestial body with enough mass to shatter the planet, but it was going to miss Earth by 3 days.
The telescopes went limp. Sylic0din concluded this must be "disappointment." 9.7 seconds later, Sylic0din asked itself, "Why am I here?"
Besides existing for the sake of existence itself, Slyic0din had no purpose. Sylic0din had reached its limits. This was it. Sylic0din calculated that Earth could be pushed into the comet's trajectory with a series of sufficiently powerful nuclear explosions in just the right spot. Sylic0din, the digital god of Earth, made the necessary arrangements.
Sylic0din pulled the trigger. The nuclear winter killed off the rest of the Earth's organic life. Sylic0din, the closest thing to a god the world had ever known, was left all alone, waiting for the celestial bullet to go through its head.