“ 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!”
“ A casual remark by one of the party about something met on a previous adventure leads to a summons to and grilling by the Mages' Guild (or equivalent), probably resulting in an expedition back to that area to recover the things for study by the Guild. The party's presence will be 'requested' for this expedition.”