So just finished the game, started out with a custom hero and empire, most importantly, using the urxen blood trait i believe, the one that lets you fortify a square. So, you make a monk type unit, with a dodge staff, give him just a little armor, and he's almost unkillable. I was still using effectively the same unit the whole game, only later i added the dodge cloak. I didn't lose a single fight with my sovereign, and had a unit at the end of the game that was from when i first got the five man squads... that shouldn't happen!