“ Something lives in the fog in a certain region and travels with the fog. Kidnaps or kills, or is simply heard and 'felt'. ... fog is rising, heed the warnings the elders spoke!”
“ The PCs are accosted in a major city containing at least one famous fortuneteller / prophet of the future. They are informed that their as-yet-unborn child will (insert terrible evil), and that, although they are very sorry, the PC must be executed to keep this from happening.”