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To get a PU with another Christian nation, their ruler must die without an heir while you have a royal marriage with them. If they aren't your dynasty, they'll get the dynasty of the nation married to them who has the most development (hopefully you) and stay independent; if they are already your dynasty (and not at war!) they'll fall into a PU under you, which may be contested by one of your Rivals. (there is a small chance of getting a PU directly even if they don't share dynasty, and an even smaller chance of outright inheriting the land, but those are once-in-a-blue-moon occurrences)
In addition to the peaceful route, if a nation has your dynasty, a RM with you, and *either* no heir or a heir with a weak claim, you can use the Claim Throne diplomatic action. This gives you Causus Belli to force a Personal Union via war. Many nations in Europe also have mission trees that give them this CB on historically appropriate targets.

In practice, if you want to fish for PUs you'll want Diplomatic ideas filled out so that breaking RMs doesn't cause a stability hit, and then pay attention to the notification flag that lists christian nations without an heir - marry them when the ruler is old, break the marriage if the ruler gets an heir before dying. Once a foreign nation does have your dynasty, if you can beat them in a war you might want to watch for them to lack an heir or even better to have a weak one, so that you can claim their throne. (weak is better than no heir if you have to wait out a truce (eg. for breaking alliance), since a heir can appear at any time but a weak heir will stay weak).

There is a massive guide to PUs floating around these forums somewhere, I've only covered the basics. There are a whole bunch of weird corner cases you mostly shouldn't worry about. The only oddity likely to be important to a random campaign is the fact that someone at war can't fall into a PU as a junior partner - if you ever have the flag that warns you you'll become someone's junior if your ruler dies, stay at war until you get an heir.


Thank you very much for your reply. I think I already missed some opportunities to "claim the throne" in both Austria and Commonwealth.......

They have the same dynasty for years....

I just didn't know what to do.....

Thanks again !
 
If I am the emperor and I am stronger then each of them (and all of them together),
can I force-vassalize four of the electors and by that secure unending rule as emperor for me?

You could do that, but that would also lead to a loss of imperial authority, making it hard to do further reforms. So if you can get their votes without force, I would simply keeping them in a good mood.
 
If you have parts of two nodes: a trade node where you collect and one node that leads into it
what is the breaking point at which it becomes more worth to steer to the collecting node instead of collecting in both?
because I have that and in both nodes I have over 50% power, but still I get more trade income by collecting in both..
 
If you have parts of two nodes: a trade node where you collect and one node that leads into it
what is the breaking point at which it becomes more worth to steer to the collecting node instead of collecting in both?
because I have that and in both nodes I have over 50% power, but still I get more trade income by collecting in both..

this sums up pretty well.

Bottom line is there are too many variables to say what the breaking point is.
 
When and how is determined who fights me in case of the heirless death of my royal marriage partner when I get a PU?

There is a country that could fall under a PU with me, and yesterday it said `in case of monarch death succession war between you and Hungary`.
Today it says `between you and France`.

When does that change? with every starting of the game? Can I restart until I have to fight Hungary again
or so?
 
When and how is determined who fights me in case of the heirless death of my royal marriage partner when I get a PU?

There is a country that could fall under a PU with me, and yesterday it said `in case of monarch death succession war between you and Hungary`.
Today it says `between you and France`.

When does that change? with every starting of the game? Can I restart until I have to fight Hungary again
or so?
I think it's the rival with the highest prestige, though it might be the one with the highest development. I'm pretty sure it's a function of the actual game-state, though, so it won't change on reload.

Every last detail about PUs is in this thread: https://forum.paradoxplaza.com/foru...ages-personal-unions-and-claim-throne.788829/
That's going to be way more accurate than my memory :)
 
I think it's the rival with the highest prestige, though it might be the one with the highest development. I'm pretty sure it's a function of the actual game-state, though, so it won't change on reload.

yeah, the annoying thing is that not only i would have to fight france, but also that france is my ally and not my rival, while hungary is someone i anyways want to fight.
 
When and how is determined who fights me in case of the heirless death of my royal marriage partner when I get a PU?

There is a country that could fall under a PU with me, and yesterday it said `in case of monarch death succession war between you and Hungary`.
Today it says `between you and France`.

When does that change? with every starting of the game? Can I restart until I have to fight Hungary again
or so?

it is likely dependant on military rating, which is a score value. this value shifts as nations gain or lose wars. It likely shifted to France because they have more good generals, more manpower pool, more morale, more tech, etc. If a nation is recovering from a war, they can steal away offensive claimant.

tip: if you don't want to have an ally as an offensive attacker, then don't ever MARRY them. if they don't share dynasty with the PU target, and if they are not a rival of target PU nation, they can't contest the Union. and then it shifts back to Hungary.

the situation will also change with tiers changing (pope or HRE emperor dying triggers it) or if target PU nation goes to war. If you are big enough, WARN target PU nation not to go to war, and warn anyone that an declare on them also!
 
the situation will also change with tiers changing (pope or HRE emperor dying triggers it) or if target PU nation goes to war. If you are big enough, WARN target PU nation not to go to war, and warn anyone that an declare on them also!

PU target started a small war. If now their ruler dies I get a noble from my dynasty on their throne.
I wonder if that would be a setback in time or like the same outcome?

With a succession war I would get them as a PU minor immediately, right?
With my dynasty on their throne I would have to wait again until they have no heir or a regency and then claim their throne and fight them and get a malus with all other RMs, right?
So this version in inferior to the other, right?
 
PU target started a small war. If now their ruler dies I get a noble from my dynasty on their throne.
I wonder if that would be a setback in time or like the same outcome?

With a succession war I would get them as a PU minor immediately, right?
With my dynasty on their throne I would have to wait again until they have no heir or a regency and then claim their throne and fight them and get a malus with all other RMs, right?
So this version in inferior to the other, right?

succession war is usually preferred yes, as you get them in Union immediatly. it can happen even with just an RM done, so its easy way of getting unions

and yes, you are right.
 
Thinking about buying some DLC, especially Common Sense and Art of War since these seem to be essential. In the PDXCON the devs considere give free olders DLC, this will be done? What DLC will be? I don't whant buy a dlc that later will be free, and if this is the case, will be compensated later?
 
Thinking about buying some DLC, especially Common Sense and Art of War since these seem to be essential. In the PDXCON the devs considere give free olders DLC, this will be done? What DLC will be? I don't whant buy a dlc that later will be free, and if this is the case, will be compensated later?

I didn't see anything about making DLC free from PDXCon. There was discussion of making certain "essential" features that currently require DLC free but not anything about making any actual DLC free. I highly doubt that in the improbable case they decide to make some DLC free in the future there would be any sort of compensation for owners of the DLC.
 
I expect to get a PU over a country I have a RM with.

What happens if
- I go to war and call them in and then the death of their monarch happens? - normal my-noble-to-their-throne ?
- I go to war and call as an ally the contestant that would have a succession war with me, so I and the contestant are in a war together and then the monarch of the pu-minor dies?
-I go to war and call the pu-minor in and call the contestant in and then the ruler dies?
 
A country can't get PUed if he is at war. So case 1 and 2 are similar : a noble from your dynasty or a local noble take the throne. In case two, another eligible contestant appear for the duration of the war
 
A country can't get PUed if he is at war. So case 1 and 2 are similar : a noble from your dynasty or a local noble take the throne. In case two, another eligible contestant appear for the duration of the war

So I can go to war, but I cant take the potential pu-minor in, yes?

(the potential contestant is France, so it would be a smart move to be in a war together with france as an ally and wait for the pu-minor-ruler to die, right?)
 
So I can go to war, but I cant take the potential pu-minor in, yes?

(the potential contestant is France, so it would be a smart move to be in a war together with france as an ally and wait for the pu-minor-ruler to die, right?)

it used to be so the succession war would fire *anyways* with France in your example, and France would *drop out* from the first war.

I don't know if that got fixed/changed yet.

so I would be cautious in your assumption.

If you call in France, and then the succession war outcome changes, then you should be safe.

But to be honest, I think it will stay xxx versus France and France would still attack *you* still in the middle of the war you called them into.

I guess you could console test it.
 
it used to be so the succession war would fire *anyways* with France in your example, and France would *drop out* from the first war.

I don't know if that got fixed/changed yet.

so I would be cautious in your assumption.

If you call in France, and then the succession war outcome changes, then you should be safe.

But to be honest, I think it will stay xxx versus France and France would still attack *you* still in the middle of the war you called them into.

I guess you could console test it.

Unless it got changed very recently without being in the patch notes this is still the case (it cost me the Lion of the North achievement by kicking me out of the League War to challenge a PU...).
 
Did any paradox dev mention anything at all about expanding the new missions at all? I seem to run out of missions by 1600 at the latest unless one has a date specified.
I haven't been in this forum as much lately since I have too much anime and other games to play so I don't know what to look for around here for this information and searching "missions" gives too many posts
 
Question, if I'm a Tributary of Ming and attack someone allied to Ming, will Ming join in as a defender?