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Europa Universalis III 46143 EU3 - After Action Reports (AAR)
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I have no clue about cheating, but I can tell you how to really do it.

First, there is an icon on the top (besides those for revolt risk, buildings, free advisor places etc) with a black head wearing a crown. This is a list of all nations with no heirs/heirs with weak claims. You're only able to establish a PU on those, so if Moldavia isn't in there, you're screwed. If they're in there, there are 4 ways.

1) Just form a royal marriage with them. You have a slight chance to get a PU when their ruler dies without heir. Incredibly risky and won't normally work out.
2) Form a royal marriage with them, then claim their throne. Wait. When their ruler dies without an heir while you have high prestige, you have a good chance to get a PU unless another nation has also claimed their throne (then it will go into a succession war). Also very risky.
3) Form a royal marriage, claim their throne and attack them with the claim throne cb. If you win (needs 84% warscore), your king will immediately become their king. Works well. You'll get -1 stab for attacking them while having a marriage and you'll need to feed them quite some money, because you need >0 relations to continue with the PU. Also works if they actually have a heir, but he has a weak claim.
4) Send a spy with the fabricate claims mission to their capital. This spy costs you 100 ducats and is not always available when they are on the list, since it has additional requirements. Will give you a cb for a few months, enabling you to form a PU if you win for 90% warscore. Will also result in your king being their king immediately. Works very well, but is not always possible.
 
Mostly correct, but their heir does not need a weak claim for you to use spies, rather they need under a certain legitimacy (~50, I can't remember exactly). This will happen due to a weak heir ascending to the throne, or through constant high War Exhaustion, which is easier to engineer.

The best options for immediate PU formation are 3) and 4) as listed by n0thin. 3) is generally easiest if the throne can be claimed, due to the cost/relatively low chance of spies. If they have a strong succession you can declare war and keep them occupied to increase WE and so lower legitimacy, until you can use the spy. The main downside to this tactic is the time it takes and the risk of another country sensing weakness in your target and coming in to annex/vassalise
 
Ranger Blue said:
Mostly correct, but their heir does not need a weak claim for you to use spies, rather they need under a certain legitimacy (~50, I can't remember exactly). This will happen due to a weak heir ascending to the throne, or through constant high War Exhaustion, which is easier to engineer.

The best options for immediate PU formation are 3) and 4) as listed by n0thin. 3) is generally easiest if the throne can be claimed, due to the cost/relatively low chance of spies. If they have a strong succession you can declare war and keep them occupied to increase WE and so lower legitimacy, until you can use the spy. The main downside to this tactic is the time it takes and the risk of another country sensing weakness in your target and coming in to annex/vassalise
Click to expand...

You also need to wait the Truce to end...
 
DDRJake said:
Pah, breaking truce only gives you a 5 stability hit and 5 war exhaustion. A tightly organised country can take that on the chin and it will be very worth it to nail a personal union, especially one that will grant you cores on inheritance.
Click to expand...
You'll also gain infamy and lose trust, making any further diplomatic deals harder. Attack another country that would draw them in if you have to - if they risk getting attacked during the truce, just guarantee them. That'll give them a better shot at fending off the attacks, as well as building trust with them so that inheritance gets more probable once the PU is established.


But why ramping their WE up, as it'll also make them a tempting target? It's way better to ascertain that you're on the defenders' side in wars, if possible. Failing at offensive wars will pull down their legitimacy by 20 for each unfavourable peace deal. It's by far the quickest way to drop someones legitimacy and relatively easily set up by guarantees of minors certain to be attacked. You could even occupy all but their capital, so that whichever nation does take the capital can only demand ducats and treaties from them anyway (and take 20 legitimacy each, too...)
 
The 'Fabricate Claim' spy mission is available when a ruler has legitimacy lower than 50% or a regency with a heir's claim lower than 33%. This information is accurate for HttT, but I don't think it has changed a lot (or at all) since then.
 
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