The Aliens
In the events that unfolded in 2325, an extraterrestrial unidentified force attacked all human-settled planets and space stations, wiping most of mankind in just several hours.
This was the first time an alien intelligent species was encountered.
For humans this was their “First Contact” and only limited information is available on this new enemy.
It seems obvious that on the Aliens, however, they had well studied humans and their settlements a long time before this attack.
Survivors were captains on a few faraway and isolated space stations, who managed to make a successful evacuation.
They suspect the Aliens are still tracking them, even to a new galaxy, and are still intent on eliminating the last humans.