Downloadable content (DLC) is content built by Paradox Development Studio (PDS) as an extension or add-on to Europa Universalis IV. They are modular in nature, which means that a player can choose to play with or without a given DLC by checking them out at the launch menu. An expansion DLC is normally accompanied by a free patch that gives players most of the new content as not to hinder the playability of the game. As such, most DLCs are seen as optional content for players who wish to have a better gaming experience in exchange for some monetary support.
Multiplayer games also benefit from this compatibility, that is to say, if the host has a gameplay DLC (expansions and flavor packs) the player does not, the game acts as if the player has it.
Note: Further details on a specific title may be available by clicking on its banner or icon.
The base game is required for any and all DLC relating to the game. While cosmetic/music DLCs can be used with any game version, content DLCs can't be used prior to the version they were released with.
Make your own decisions: Nation building is completely flexible and the possibilities are endless.
Use your Monarch Power: Experience the new system of monarch power where your choices are influenced by the caliber of the man or woman you have at the top and will direct the ebb and flow of gameplay.
Experience history coming to life: The great personalities of the past ready to support you as you make your mark on thousands of historical events.
Turn the world into your playground: Enjoy hundreds of years of gameplay in a lush topographical map complete with dynamic seasonal effects.
Experience the all new trade system: Become a trade empire and gain control of vital trade routes to make the wealth of the world flow to your coffers.
A deeper diplomatic system: Bring out your negotiating skills, use coalitions, royal marriages and support for rebels and explore the possibilities of the new unilateral opinion system.
Create your own history & customize your game: Customize and mod practically anything your heart may desire or use the Steam Workshop.
Cross-platform Multiplayer: Battle against others or try the co-operative mode that allows several players to control a single nation (up to 32 players).
New Estates: 3 New estates to deal and manage in the realm -- the Cossacks, the Dhimmi, and the Tribes.
New Cossack Government: The Cossacks receive a new government form with unique interactions.
Diplomatic Feedback: Manually set the attitude towards AI nations, designate provinces you want, entice allies with the promise of land for their support.
Tengri: New religion mechanics focusing on Syncretism, allowing Tengri nations to choose and tolerate a secondary religion as if it were a national faith and treated by others as if holding that religion.
Horde Unity and Razing: Hordes can raze territories they conquer to get monarch points and raise horde unity or risk a tribal uprising.
Advanced Culture Change: Adds the ability to choose what culture you want to convert a province to from any neighboring culture, or restore the original culture of the province.
Native Policies: Adds the ability to set your policy towards the natives in your colonies, allowing you to focus on trade, assimilation, or subjugation.
Improved Espionage: Two new spy actions allowing you to study the technology of more advanced countries and agitate for liberty in your enemies subjects.
Historical Ages and Golden Eras: Meet objectives in four historical ages from the Age of Discovery to the Age of Revolutions, earning new bonuses and powers for your country. Declare a Golden Era to further increase your chance of success.
Chinese Empire: New mechanics for Ming China, including Imperial Decrees and Imperial Reforms to bolster the Dragon Throne.
Tributaries: Force your neighbors to pay tribute to your Chinese Empire, paying you in gold, manpower or monarch points.
New Japanese Rules: Daimyos now owe loyalty to the Shogun – and the Shogun is whomever controls the imperial capital of Kyoto. Compel the loyalty of your daimyos with new interactions that require them to submit to your authority, contribute to your power or even commit seppuku.
Manchu Banners: Rally the Manchu warlords around your throne and call up the traditional banners to reinforce your army.
Diplomatic Macro-builder: Common diplomatic actions are now easily available from the macro-builder interface.
New Governments: Powerful decisions related to each of the special government types of the Middle East, including unique mechanics for the Egyptian Mamluk Government, Persian Theocracy, Tribal Federations, and the heirs to Timur.
Trade Policies: Activate your merchants in trade nodes for special missions – promote profiteering, espionage, military, diplomacy, and religion propagation.
Islamic Schools: The wide range of Muslim disciplines offer unique perks to their disciples and transforms international relations across the Middle East.
Army Professionalism: Drill and discipline your armies as you move from the age of mercenary captains to the mass levies of standing armies.
Exploit Development: Reduce the strength of your provinces for a quick influx of cash or manpower, stripping your nation's future for immediate gain.
Iqta Taxes: Muslim governments can impose new taxes every 20 years for special bonuses.
Ability to directly convert subject's provinces to their state religion
And more: Changes to national ideas, missionary actions, Turkish Janissaries and many other game mechanics.
Picture a capital city that shines like a gemstone, improved by the wealth drawn from the hinterland - decorated by riches demanded from vassals. 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 it and then make it so in Europa Universalis IV: Leviathan.
Immersion packs are expansions of a smaller scale. Unlike regular expansions which are broader in focus, immersion packs focus on on specific regions to bring them better to life by granting more flavor (in addition to the accompanying free patch).