It is as moments such as this that I really hate myself for never spending any time with ciphers. A clue would be very nice.
The Unbroken actually is just a small transport, almost unarmed and lighly armoured, not much use in a fight but thats not its purpose, it just carries the inquisitor and his staff, and the cargo bays are useful for labs and torture chambers and the like.
I really hope to not run into that World Eater though.