Does anyone have some massive portent appear in a campaign? Maybe one night, a big-ass green comet appears in the sky. The GM just mentions it.
The next game, he mentions it again. This continues, with maybe local
NPC mages and priests getting real worked up and even hiring the players
to obtain some lost magic item that will be needed as the comet reaches
Or maybe some big bad will take the comet as the sign that he needs to
destroy the players homeland RIGHT NOW, so they get sucked into a war.