Imperial debacles, heroic last stands, the valiant defence of an island, arduous desert crossings and a deadly hunt with the PCs as prey, not predator can all be found in The Variscan War, a mini-campaign (25-40hrs) for medium-high level characters.
You receive a vision of a rooftop "somewhere close by", where a rare moss grows; in the vision, you know the moss is suitable for greatly enhancing the effects of certain types of potions. Now go and find that rooftop. Don't fall off. (Of course, rooftop runners *will* be taken for miscreants by the local City Watch....)