How many and how far reaching changes can PCs in your campaigns achieve? If you are using (semi-)official settings, how far can your PCs go? Is there a line they cannot cross, powers and beings they cannot topple, catastrophes they cannot cause (by accident or design)?
Are there "fixers" (NPCs, or gods) who "keep the setting on track"? Do you "restart" your (semi-)official/homebrew worlds after each campaign, resetting the changes, or do you keep a continuing history based on your PCs actions?
In short, how free to create and destroy are the PCs in your campaign? Do their actions top "official" events and changes?
Are there "fixers" (NPCs, or gods) who "keep the setting on track"? Do you "restart" your (semi-)official/homebrew worlds after each campaign, resetting the changes, or do you keep a continuing history based on your PCs actions?
In short, how free to create and destroy are the PCs in your campaign? Do their actions top "official" events and changes?