I have heard some pretty good titles, but i can't argue with Knights of the Old Republic: The True Sith or even The Unknown Threat.
Now it may not be the best, but i have to try, Star Wars Knights Of The Old Republic The Shadow Of War. This is a great title because it represents a inevitable war by a great enemy. Though i like The True Sith better, i just don't want to be left out
Or to change my title a little, The True War. This title represents an on coming war as i said previously but it also says, that the wars in K1 and K2 are just the calm before the storm. Likewise with the title, The True Enemy, (though that would be the same as the True Sith) only instead of the wars, it would be about the enemies in K1 and K2.