I was wondering, how do the Rattkin get from Guardia, to Dominus. My best theory is they snuck aboard one of the ships headed for dominus, and snuck out. Perhaps the helazoid ship, since its the closest ship that landed to trynton, or the T'rang ship.

Well, in Wiz7, the Rattkin told you that they planned to move elsewhere, and payed you for getting the arrival time of the next T'Rang ship. It was the Nargisst Shuttle, which is now at Dominus.

OK, never got that far in Crusaders. Was in the final dungeon of Munkharma when I got diseased and saved by accident. Then again I was 9 and had no clue what i was doing.