The swirling snow fell on the soldier's shield,
covering the symbol of Hrothen's Hope.
The swirling snow fell on the dwarf's black beard,
and melted into the darkness.
-opening poem of Hrothen's Curse, a dwarven tale
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....)