New ship complete known only as the "Mosquito".
This is a known craft through out the galaxy that usually travel in packs. These things have made it extremely tough for the fringe worlds and made Dark Space extremely deadly to travel as its been told of some being lurking about.
Children stories tell of it as the "Broods Den". Where entire settler convoy's and expeditionary forces would vanish without ever hearing a word. These stories are usually told to frighten many from ever venturing past the territorial lines of their homesteads.
However I believe that it exists. That this thing lurks about waiting for its time to strike and when it does no one would be safe and entire planets will be swallowed by the coming locusts of ships spawned for the belly of the beast. If it were a whale it would be the biggest whale to ever swim the seven sea's.