Just read two complaints about the game that I thought could be addressed at once - that defending your holdings with garrisons is difficult/impossible when tougher monsters come calling, and that Path of the Governor requires active monster-hunting to be useful. Solution - give Path of the Governor a bunch of traits enhancing city/territory defense (and make monsters aggressive enough to actually go for cities after entering your territory, rather than wandering around while you wonder what to do).
Here are some possible trait bonuses:
Double road movement (to better defend a large empire)
Double HP for city militia units (these units are currently irrelevant against tough enemies except as temporary meatshields - might as well improve that function)
Double city defensive bonuses (so double the defending dodge boosts, double damage for Wall of Fire, etc.)
50% bonus to own Defense when defending a city.
Spend 5(maybe more) influence to halt a monster in your territory for 1 turn (on the strategic map) unless it resists.
Think this would help?