Europa Universalis IV: Art of War [Online Game Code] 30 years War: Unique mechanics and events for the religious conflict that ravaged Europe. Napoleonic Era: Fight for or against the revolution and create entirely new custom client countries on the map from your conquests. Fighting on land or at sea: You can now sortie from sieges, transfer occupation to allies and give objectives to your subjects and allies. Marches: Turn your vessels into bulwarks against your enemies, getting less tax but strengthening their defenses. Improved Diplomacy: Sell Surplus Ships, Fight for your subjects CB, Declare War in Support of Rebel factions in other countries and new peace options.