Probably one thing that we all have found annoying in CK2 was heroically defending our country, alone, against a much superior enemy or, even better, against a holy host of infidels in a great holy war and, at the end of it all, getting only some small bucks and a measly prestige boost compared to your great military success.
I think that CK3 needs to address this problem: how to make defensive wars valuable for the defender? And we should also look at the other side in the war: how to make waging war riskier for attackers?
As for money and prestige, my suggestion would be to find a way to "scale" money and prestige obtained according to realm type and size and taking into considerations the kind of casus belli. So, for example, as the Duke of Brittany, defending yourself from a single county claim CB from the Count of Cornwall should get you relatively small amounts of money and prestige. Defending that country from France, however, should get you a considerable amount of money and prestige for your size. Defending against a whole Jihad coming to strip you of all your titles should give you a considerable amount of money and a massive prestige boost.
But it's not only about money and prestige of course. We also need to factor land gains in. This is where things start to get complicated: a full-on peace treaty system a-la EU4 might be unrealistic, and I don't think anyone would like Umayyads getting provinces in Britain just because they defended against a Germanic prepared invasion. What I think could be done, though, is this: if you win a defensive war against someone you have claims on, you should get either one or multiple of your claimed lands, maybe according to the CB (county-level CB gives you one county you have a claim in, duchy-level CB can give you a duchy you have claims on, or an equivalent of 3-4 counties, and so on); if you win a defensive holy war against someone you have land borders with, you may be given the opportunity to get bordering counties/duchies; winning against your tyrant overlord who tries to revoke your titles might net you not only independence, but maybe even the chance to seize his crown.
Anyway, these are my suggestions, I'd like to see what are yours about defensive wars and how to make them worthwhile for defenders and dangerous for attackers, hoping that Paradox has already a solution for this or will have in time even after release.
I think that CK3 needs to address this problem: how to make defensive wars valuable for the defender? And we should also look at the other side in the war: how to make waging war riskier for attackers?
As for money and prestige, my suggestion would be to find a way to "scale" money and prestige obtained according to realm type and size and taking into considerations the kind of casus belli. So, for example, as the Duke of Brittany, defending yourself from a single county claim CB from the Count of Cornwall should get you relatively small amounts of money and prestige. Defending that country from France, however, should get you a considerable amount of money and prestige for your size. Defending against a whole Jihad coming to strip you of all your titles should give you a considerable amount of money and a massive prestige boost.
But it's not only about money and prestige of course. We also need to factor land gains in. This is where things start to get complicated: a full-on peace treaty system a-la EU4 might be unrealistic, and I don't think anyone would like Umayyads getting provinces in Britain just because they defended against a Germanic prepared invasion. What I think could be done, though, is this: if you win a defensive war against someone you have claims on, you should get either one or multiple of your claimed lands, maybe according to the CB (county-level CB gives you one county you have a claim in, duchy-level CB can give you a duchy you have claims on, or an equivalent of 3-4 counties, and so on); if you win a defensive holy war against someone you have land borders with, you may be given the opportunity to get bordering counties/duchies; winning against your tyrant overlord who tries to revoke your titles might net you not only independence, but maybe even the chance to seize his crown.
Anyway, these are my suggestions, I'd like to see what are yours about defensive wars and how to make them worthwhile for defenders and dangerous for attackers, hoping that Paradox has already a solution for this or will have in time even after release.