Another thing you should also take into account, that a partially union is not really possible with the stability mechanics we have here
If the "losing" civ losts half of it's territory, the stability will be so low that there is no point keeping the civs in. Will collapse in a few turns anyway.
Also, huge territory of the "winner" civs will be on the loser civs war map.
Would be really strange to see: Lithuania declared war on the union of Poland-Lithuania, or the remnants of Austria on the union of Hungary-Austria ,)
Currently the only "partial" union is Brandenburg-Prussia. What happens in the other unions is that the remnant, if any, is force-collapsed.
What should be with respawns?
I can imagine this both ways:
The respawn means the "loser" civs sruggle for freedom - like Hungary's several attempts in the 18-19th century
Or disabling respawns could be better for gameplay
I'm thinking of keeping respawns in, unions were after all broken at several times (Sweden, Hungary, Lithuania during the Deluge). There might be a mechanic to reenact the union if you manage to collapse or capitulate the reborn civ.
You are right that religion should be important too
But I think an union should only be possible between nations of the same religion
Religion was way too important in medieval Europe
Morholt, you can even give this a new screen (4th power calculation), faith points are perfect for it
I don't want to make unions be impossible between different religions, since Hungary might be Orthodox and Lithuania Pagan. There will be a penalty to the AI's willingness to go ahead with it instead.
Generally, I'd agree with the religion thing, but Poland-Lithuania might have to be an exception. I think that the Union of Krevo (1385) should be the date for union between these two, especially if you want a united front against the Teutonic Order.
Good idea, there should first be a moderate-probability union opportunity around 1385 and then a high-probability opportunity around 1569.
I am thinking about RFCE here, but the only other such Unions would be "Leon-Aragon" (this mod only) and Austria-Hungary. I don't think France-Burgundy qualifies. Maybe a temporary Spain-Portugal one. Am I missing any?
maybe an Ottoman Egypt one (when theyre included) a Denmark and Sweden union to represent the Kalmar Union. England and Scotland around 1700s. Muscovy and Novgorod? I'm not sure on the history of the formation of Russia so disregard that if its historically inaccurate.
This looks good. I would include a few other unions with lower probabilities of success:
Spain+Austria+Burgundy
Spain+France
Netherlands+England
Following Unions for the Middle East:
Ottoman-Egypt (when put in)
Ottoman-Hafsid
Ottoman-Arab (if still alive)
Ottoman-Morocco (low chance but still possible)
Arab-Cordoba
Apart from the list, I'm also implementing
Treaty of Pereyaslav between Moscow and Kiev if they survive that long or respawn, as well as a lower-probability
Treaty of Hadiach between Poland and Kiev.
Spain-Portugal and Ottoman-Hafsid will also go in.
Kalmar Union will not be in the next version since I'm redoing Scandinavia the version after that anyways. Then it will be something like: Sweden-Norway 1336 (Union under Magnus IV), Denmark-Sweden 1389 (Union under Margaret), Denmark-Norway 1483 (Under John of Denmark) and again 1536 (Formal incorporation of Norway into Denmark). I really don't want to bother with tripartite negotiations and the Kalmar Union wasn't entered into at the same time anyways (There was a formal treaty document but it was never properly ratified).
Spain-Austria will not happen mostly for gameplay reasons, but also the fact that the Spanish and Austrian Habsburgs came into conflict almost immediately. Spain-Burgundy might happen.
I don't like unions like Moscow-Novgorod or Ottomans-Egypt where one nation historically conquered the other. Unions are supposed to represent mostly peaceful agreements.