A technological terror
Some stories call it the first real warship, others just Typhoon. But they all agree on one thing, the ship is one of the most elite in the galaxy.
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....)