EU4 Art of War is the third expansion pack for the Europa Universalis IV, which is a part of the popular grand strategy wargame franchise, Europa Universalis. This expansion pack revolves around the Thirty Years’ War – a war between various Catholic and Protestant states – which is often described as one of the most destructive conflicts in human history. The expansion pack was developed and published by Paradox in 2014.Create your own custom client statesWith EU4: Art of War it is possible to create client states – states, that function similarly to vassals, but with several advantages over the latter. Most importantly, client states have smaller coring cost and reduced unrest, making them slightly better at integrating territory in comparison to your usual vassal. To prevent this feature’s overuse, it is allowed to only have a maximum of 10 client states simultaneously.More diplomacy featuresIn Art of War DLC you will be able to sell ships to other nations, support rebels fighting in