What are the best national ideas you can give a custom nation? Web Designer for testing Custom Nation settings on Paradox Interactive's game Europa Universalis IV. Or simply add cosmetic tags like in HOI4 to EU4 (͡° ʖ̯ ͡°). If you love making custom nations you'll love 'Custom Flag Symbols'. First up is an addition to the Custom Nations Designer We've unit from the best sprite pack now available in the nation designer. Thereafter, additional provinces may be added. Creating a custom nation begins by selecting a capital province. You asked: “How hard is Europa Universalis IV. It's been developed extensively over a long period of time, and it shows. I am trying to think of some good custom nations for a multiplayer games! Pitch ideas here! That all said, EU4 is a winner. What your best custom nation? Where did you start? It can be really fun to tailor a nation to one specific goal – for example Super Venice. Ideas: Traditions: +20% provincial trade power, % light ship cost. › Forums › Games › Europa Universalis IV. Tradition = Moral/Army Tradition (both relatively cheap and helpful early on.