Just some other Features which are really important for gameplay in my opinion, as well as giving some nice flavor
Paid features
It's now possible to declare a "support rebels"-war against a country that you're supporting rebels in
(It's now possible to set an allied in war to prioritise sieging a specific province)
(It's now possible to set the military focus for your subjects to be Aggressive, Supportive or None, which changes what tactics they will use during war )
You can now mothball fleets, which means they will cost less maintainance, but slowly detoriate in the port
You can now designate your vassal into a march They will no longer pay tax to you and you can't annex them, but they will get bonuses in warfare
It's now possible to use your subjects CB/Wargoals when declaring a war !! (one of my favorites)
Added Client States mechanics, where you can now create new custom vassals, decide their name, flag & color, and assign them territory as soon as you reach a certain tech level
It is now possible to transfer control of a province to someone you are allied with in a war !! (best feature EVER!)
Added peace option "Give up claims" that forces the enemy to give up all their claims on you
Added peace option "War Reparations" that forces the enemy to pay a fraction of their income to you each month for 10 years
Added the possibility to upgrade fleets in one click if you can afford it
Added abandon idea group functionality, where you can change your countries setup for the future (not used so far, but I can imagine that it can be useful)
You can now toggle your fleets to let your allies & subjects load armies on them
The Holy Roman Empire now have a mechanics for internal religious wars, including leagues for Catholics and Protestants that fight over the faith of the Empire
50 events related to the Thirty Years War
Honestly, this may not seem as being the biggest changes, but now there is so much more possible to plan wars and their results. I.e. I know that it is really gamey, but as Castille I take in the first war with France only bearn for myself and transfer occupation of non guyenne cores to aragon. But even in the not so gamey way (because of the wedding you can load some of the AE to aragon, and diplomatic formation of spain ==> no dip mp cost, instantly, no dip rep penalty, no automatic 75% Autonomy) you can use this to your advantage. Even by taking AE yourself, you have no OE as you can give many provinces at once to your subject. And even more important, your subject doesnt care about the religion and culture of the province. Surely, they will nerf this feature (even though I hope not). But now I eliminated france nearly in 3 wars with the help of burgundy+austria+aragon(+naples)
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