Portal

A Portal, or "God's Finger," is what connects the Triad together. The immense ammount of energy required to sustain such an anomaly is unthinkable, but the Portals never collapse, as Silver Threads do. This energy also creates warping of spacetime, strange wheather anomalies and can suck unsuspecting travelers across to the other world.

Location
Portals move, but very slowly, and generally stay in one area, content to move in large circles as time passes. However, sometimes they move quite far, as Earth's did, moving from near the coast of Spain, where it first opened (sucking Atlantis through to Valearia, where it sank to the bottom of the ocean) to where it resides today. On the Valearian side, the Portal is a mile and a half north of the main continent, over the water. When it opened, it was only a hundred meters from the coastline and half a mile more to the west.

Valearia's Cythrawl portal is in an underground labyrinth on the main continent's northeastern corner. Before Cannoraoul's destruction, its Portal was on a small island (which was built as Valearia's end of the Portal moved through the ground, creating the labyrinth and sucking immanse amounts of dirt and rocks through) in the far north. Now it rests at the top of a mountain on Cythrawl's core.

No Portal between Earth and Cythrawl has ever existed.

Anomalies
The Portals are sustained by an immense amount of energy from the Void. This energy often leaks out unused and uncontroled and does some very strange things before dissapating. The most troubling of these is bending of spacetime. In a real account of one such spacetime warping, a plane that was flying towards Florida was two hours from the coast and flew into a yellowish cloud. Also, traveling through the Portal at the wrong time could result in you being shifted up to a few hundred years in the past or even the future, though time-shifts are usually only a day or two long in the rare account of them happening. Two minutes later it exited said cloud, flying now over the mainland. Electric storms are common and disappearances happen from time to time when people accidentally sail or fly right into the Portal.

However, it is interesting that the Triad each is a different size and therefore would have different gravity; it would have different diseases and slightly different atmospheric content. These would be uncomfortable if not deadly to travelers, especially deadly diseases like Fireskin which would easily spread to any without some immune defense. Since this disease is not on Earth, logically it would quickly kill off earthlings. The same goes for Earth's viruses like the flu. However, traveling the portal seems to make you fit into each planet as if you belonged there. These shifts in biosphere have no recorded affect on travelers. It is unknwon why this happens.