I pick a concept, one that covers a primal fear of man (My personal favorites were "creature outside of the village/campfire", or "starvation") and use that as a theme. These are things of vast power, akin to demons, and should be treated as capable of vast and terrible thematic alteration in the Dreaming, where their power should first be displayed. If looking toward the mundane realm, terrorist attacks, a steep rise in crime, war breaking out.... Whatever makes people afraid to go outside are appropriate for the Autumn world. The key factor to addressing them is whatever...