Alright, then allow me to give out my spiel for what has happened in the past of the setting.
After the greater majority of humanity had left Earth, only a few million remained. These unfortunate few were abandoned, and left with a dead world.
The son of the former head of the SentMach project and CEO of Final Technologies was among these few, having remained by choice. This man, named Grekary Helns, could not bear to leave his home world behind and put his trust in the machines his father had created to guide humanity out among the stars.
He worked on trying to improve the lives of the remaining people of earth by using the foundries used to create the fleet to churn out SentMachs and automated drones. These creations, in theory, would provide the labor force to rebuild the crumbling cities of Earth, and begin to work on restoring agriculture.
For a time, this was successful, the SentMachs proving an efficient workforce, only numbering a few thousand. Grekary had told them that it was their duty to protect and preserve humanity. However, it would only last so long.
Each and every SentMach was created from a singular base configuration, and the process of building them was nearly uniform for each and every one. Each SentMach grew into the being they were as they lived their lives, this sense of self however would not lead to the second ending of the world.
The SentMach’s core, their beating heart and source of power, had been conceived by Grekary’s father, and was intended for use in space. They were not meant to operate independently for long periods of time, their cores mainly serving as a form of battery that needed to be recharged. For those SentMachs with the colony ships, that recharge would be given to them by the ship they were on, which in turn gathered energy with solar panels.
On the planet Earth, there was no Sun to give the energy needed for the SentMachs to live, the sky having long been turned black by the fires of industry. As power reserves ran low, and SentMachs were forced to deactivate due to a lack of energy, the main workforce on old Earth began to fear for their existence. What soon followed was a war fought for survival, as both organics and SentMachs needed the precious little power to survive. For the organics, it was to power the artificially lit farms that served to feed the struggling populace. The SentMach simply needed the power to continue operating,
The worst of the fighting was quick and bloody, but it still has not fully ended. Every inhabitant of planet Earth is in a desperate struggle for survival, SentMach and human alike have formed small communities that desperately try and scrape together the power their bodies demand.
You have just awoken in this world.