Shattered Worlds are connected by its Source Beacons, producing what is called the Eldritch Routes, these routes are like tunnels along the Eldritch Sea, and they are considerably faster to traverse turning years of travel into weeks, and also considerably safer, as the eldritch sea is dangerous and the Eldritch Routes works like a large net protecting the Nimbus Ships from biggest dangers on the Eldritch Sea.
Eldritch routes only go in one direction, they cannot go in the opposite direction, needing to make routes spawning different locations to be able to return to the place of origin.
Some creatures are still able to pass through the net of the Eldritch Routes, and is possible for Nimbus Ships to leave them.