What's chasing the Vasari

I think my friend said they were running from a virus or disease, but i'm not sure where he heard it. Personally, I don't know.

mamby we will see in a expansion later on?

Well I don't know about a virus or disease, but the opening cinematic shows the problem starting at a transportation lab, so I'm thinking the vasari started playing around with ways to change the structure of space around a ship in order to enable it to travel faster than light, and they wound up creating something like the warp grenades from David Weber's Empire from the Ashes series except supersized. A warp grenade is a grenade that emits a field that drags things into another layer of reality (i.e. hyperspace) and leaves it there without a way back to this layer.