Portals

According to the Canticles of the Demiurge, there were two sources of material when he made the world. The first was the bodies of primordials slain in the Dawn War. The second, taking advantage of the instability of the region of reality and the naturally occurring portals already there, the Demiurge punched holes into various planes for the energy and material that he wanted. At the heart of every spring is a portal to the Plane of Water, and every fault line has a portal to the Plane of Earth. Hurricanes, earthquakes, forest fires, most of these are explainable by the unpredictable openings and closings of such portals.   Portals appear as circular or linear tears of nearly any size. The tears are more common, allowing only amorphous materials such as air or water through. While the material spewing from them can be dangerous, they won't generally interact with physical contact by people or objects. The circular portals allow travel of larger people or objects through.   A third type of portal exists: demiplane portals. Rather than connecting to a completely different plane, they connect to imprints or depressions in reality. These demiplanes are typically very small, no more than two hundred miles across, and they can have wildly bizarre natural rules within them.