I'm not sure if this is a bug or not, but the "Mastery of the Arts" variable appears to give a major debuff in the campaign for nearly all clans. For the player (unless you are Tokugawa, who get a +45 for some reason), you get a pretty hefty -25 diplomacy penalty. AI clans? They get a HUGE -140 penalty with other AI clans, to the point that the entire diplomacy map is bright red. Is this intentional, or is this not supposed to happen?