So... what to do with seasons? Winter could be potentially lethal. In summers we could have droughts in particular regions.
I wonder if they could be modelled with the epidemic system that was in CK1.
I'm assuming there are global flags like in all recent Paradox games. If so, how does something like this sound:
- At any given moment, it will be either Winter or Summer. This will be set as a global flag.
- Each season can be either short, normal, long or extra-long (neverending? legendary?). This will also be represented by a global flag.
- Summer will always be followed by a Winter of the same kind. Short summers will always be followed by short winters, and generation-long Summers will always be followed by horrible, deadly Winters (of course, the first Winter when starting from the beginning will always be one of these).
- After a (mostly fixed) amount of time, which depends on the length of that particular season, a "Winter is Coming" or "The Snows are melting" event will fire. When summer, it will trigger a "White Raven" after a semi-random amount of time (a few years) that will change the season into Winter, of the same kind as the Summer. When winter, it will trigger four different random events with different probabilities/mtth, each one corresponding to the four different lenghts. The one that fires first will determine the kind of Summer that will follow, change the season and prevent the other three from firing. These events will all look the same so the player won't know what awaits him in advance. If possible, these events should be global (I assume there will be global events too, Horde related events will probably be like this in vanilla).
When the right flag is set, one by one all provinces will get nasty modifiers (if Winter) or lose them (if Summer). It should go from North to South in Winter and South to North in Summer (the epidemic mechanics could be useful, as you noted), and probably the modifiers should be worse in the North (and maybe almost non-existant in Dorne, this way we could have a house weak in Summer but strong during Winter, an interesting change of pace). The Northern houses might get special buildings/cultural bonuses to compensate for this, as they are better accustomed to these terrible conditions. These modifiers should hugely decrease the support limit and give a significant hit to manpower and income, at the least.
Winters should also bring special events. For example, I recently had an interesting idea. The world of ASOIAF appears to be extremely stagnant, with hardly any "technological" or cultural advances in centuries. At the same time, their seasons are the other big difference with our own world. What if these are related? Winters, specially long ones, might make provinces "forget" their advances. This way, the technological gains made in the Summer could be partially lost in Winter, and we have a much more "slow" world as a result.
And then of course we have all that nonsense about snarks, grumkins, others and such fairy tales
