Total War: Rome 2 has a fourth patch available which contains major AI improvements when it comes to the construction of new buildings, food supply management, creation of armies, "technology researches and tactics used during battles." The patch makes the AI more organized and challenging, and further tweaks and improvements have been made to the diplomacy, missiles, melee units and much more. Patch 5 will enter beta next week. You can view the large list of patch notes through the Total War Wiki.
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