In my current game there seemed to be some random event that caused the korx to suddenly have three times as much military rating than any body else together! then i saw what caused this...he got of fleet of rangers! the ships had normal names like the ones he can build but their class was named as ranger(btw some ship names were from tiny and some from small hulls). he got 5 of them in one fleet -> 150 attack and 100 defense rating and over 300 hitpoints while my best medium ship got 8 in attack and 4 in defense rating.
I know there is an event that gives you a ranger class ship....but not 5 at a time with strange ship names?! and the ki never renames his ships either as far as i know. maybe there was a bug that turned all ships in one of his fleets into rangers...
Game version: 1.1