cbwjm
Legend
I've been thinking about domain play recently, not because I need to, but because I've started reading through birthright again. There's a few things out there that can be used depending on how much detail you want.
- The Rules Cyclopedia is fairly detailed using 6 mile hexes, each of which have varying resources available out of vegetable, mineral, and animal. Combined with the number of families on that hex you get a certain amount of income.
- Birthright uses provinces, each approximately 1000-1500 square miles (about the size of Cumberland in the UK). The details are fairly abstracted, you have law holdings which control territory, guild holdings which can provide more money and set up trade routes, tenple holdings, and magical sources that allow realm affecting magic. Domain play is very structured, it might be more than many would need.
- I used dungeon world tags when describing my territories, and I think I'd probably use this for domain level play due to how simple it is. It's loose in requirements, you don't really have to define specific numbers, instead you can say that a PC's new barony in the border regions is growing, has an iron mine and lumber as resources, and owes fealty to a duke. There might be challlenges that need to be overcome to secure the barony like orcs, goblins, or a dragon. It's simple.