Leviathan also brings new improvements to other core areas of the game, such as colonies and regencies. New diplomatic actions give you the means to go up against mightier counterparts and new economic tools will allow you to establish rich vassal empires that draw wealth and development to your monumental capital city.
Get new tools to centralize and accumulate power for your country. Picture it and then make it so in Europa Universalis IV: Leviathan.
A capital not of a mighty territorial empire, but of a compact and concentrated state that can still use gold and favors to influence neighbors and rivals.
Picture a capital city that shines like a gemstone, improved by the wealth drawn from the hinterland - decorated by riches demanded from vassals.