1 - Natural Disasters: Having the ability to send Earthquakes, Tornadoes, Tsunami, Flood, Fires.
2 - Tech Tree (Maybe, i dont know,)
3 - Diseases: adding Diseases into a nation and having 4 types of ones to choose from, to Pathogen, Virus, Disease, Parasite, or the Undead as you can watch it slowly spreading inside of a nation till going to the next or scattering around the map.
4 - Vehicles: (Yeah No its not important to add vehicles.)
5 - Events: like a Revolution or Civil War or even different ideology for example: Communism, Democratic, Monarchy, Fascism