The Omen Rift
Unique to all the world, the Ley Lines and Nexus Points in the Free Lands are not stationary. They bounce around, jump and dive and otherwise move randomly like arcs of electricity through air. In fact, this is just about the closest one can come to an accurate description. If the Earth could be considered a crystal ball, then The Free Lands would be a bullet hole in it. Before the bullet hole, there was a powerful nexus point here, a point where life energy congregated before being recycled into the biosphere. The Omen Rift created a chip in the otherwise smooth surface. With each subsequent rift created by the architects of the cataclysm, the chip grew cracks that spread across the planet, weakening the integrity of the biosphere. When the great cataclysm finally occurred, the metaphysical biosphere was totally obliterated in this location, turning the crack into a wide hole, a gap in the surface of the biosphere. Without a properly conductive surface upon which to establish a proper nexus, the ley lines that came to this area were left to flail about like unsecured hoses. What had once been a large, stable nexus point became a chaotic collision of flows between the seven ley lines that connected here. Any time the flows of two or more ley lines intersect, a smaller temporary nexus forms. The larger the nexus the greater the chance of a rift forming. Rarely, if ever, have all seven ley lines formed into single nexus; and each time they do, a monumental rift is guaranteed to form.
Found solely in the The Free Lands between Chi Town and the Republic of Ishpeming, whenever a rift forms in this area, it is considered the Omen Rift; even though the actual Omen Rift was just the one rift that opened between this location and the 21st Century through which our player characters travelled. Because of the oddities of space and time, all these rifts have been occurring every week or so in about the same location as the original Omen Rift since the great Cataclysm.