in-character text follows
The war had been going badly for Sebenkia for... well, a while at least. Sure, you could say Sebenkia had the best weapons, but being so few in number, and fighting on so many fronts meant that they were being overwhelmed continually.
With only the inner sanctum of Sebenkia's region of control remaining uncontested, they had finally managed to establish a stable front. They had time, but not nearly enough. The only option now was to strengthen the border with everything they had and search the old labs in the wastespace, near where our newest threat emerged.
Our "newest threat" was mostly robotic in nature. A fleet of ancient warships, discovered on a barren world in the wastespace area, held some valuable and advanced technology and had been under research by the corporation.
That was, until it was somehow "re-activated" by the research team. They managed to get a distress signal out, but nothing was heard of them.
Their research project, however, was most certainly heard of again- and they announced their presence with an unseen assault on everything in the system. Caught off guard in a relatively safe area, the research teams were destroyed. So began the crusade of destruction that would test Sebenkia to breaking point.
An image of one of the alien fighters, pieced together from wrecks and combat records:

Reports state that they are armed with antimatter weapons and can outrun just about any craft, but forward scout versions seem much weaker and have been sighted much closer to the border of wastespace.