I'll use an example I actually ran, an adaptation of Babylon5 to D&D.
I told my players that the campaign would be a naval military campaign from the human perspective. Humans had just recently discovered other islands and other races.
So every player had to make a PC that could serve on a human Navy ship as officers, marines, ship's mage, etc.
As a GM, this allowed me to do the following:
get the party moving toward basic D&D missions as an activity
explore working to get promoted
explore recieving orders, and disobeying them when it was the right thing to do
swashbuckling pirate action
a military court martial
a live-action interrogation
underground railroading of innocent fugitives
war, sacrifice and loss
honor and pride
By choosing the Setting, and the PC starting point, I emphasize the kind of themes we would be exploring without explicitely stating those themes.
I was reasonably certain I could get my merry band to the Battle of the Line (and I did). But they could have gone mutiny and that would then be a new theme (pirates!).
Had I chosen the setting as "you guys are a bunch of rogues in the same thieves guild" then this big Elf vs. Human navy battle would not have been a crucial theme in the game. let alone if I let the PCs just pick any random classes and races.
For the purposes of a campaign, I don't consider that we are going to explore just 1 theme (the Battle of the Line) or even a list. I just know that when I pick a certain starting environment, there's a number of obvious kinds of possible outcomes and stories that can come out of it.
I told my players that the campaign would be a naval military campaign from the human perspective. Humans had just recently discovered other islands and other races.
So every player had to make a PC that could serve on a human Navy ship as officers, marines, ship's mage, etc.
As a GM, this allowed me to do the following:
get the party moving toward basic D&D missions as an activity
explore working to get promoted
explore recieving orders, and disobeying them when it was the right thing to do
swashbuckling pirate action
a military court martial
a live-action interrogation
underground railroading of innocent fugitives
war, sacrifice and loss
honor and pride
By choosing the Setting, and the PC starting point, I emphasize the kind of themes we would be exploring without explicitely stating those themes.
I was reasonably certain I could get my merry band to the Battle of the Line (and I did). But they could have gone mutiny and that would then be a new theme (pirates!).
Had I chosen the setting as "you guys are a bunch of rogues in the same thieves guild" then this big Elf vs. Human navy battle would not have been a crucial theme in the game. let alone if I let the PCs just pick any random classes and races.
For the purposes of a campaign, I don't consider that we are going to explore just 1 theme (the Battle of the Line) or even a list. I just know that when I pick a certain starting environment, there's a number of obvious kinds of possible outcomes and stories that can come out of it.