Traveler is a runegate-oriented discipline available to any character in the game. This discipline grants a player several options for travel in addition to the basic gates available to all. The mechanics of this discipline can be hard to remember, and even a veteran player may need to reference a runegate map.
On each map there are many runegates organized into one or more sets of five corresponding to the five Traveler powers (Earth, Wind, Fire, Water or Spirit.) With a few exceptions, within each set any one of the runegates can access any of the other four using these powers. If there is more than one set then there will usually be a "grand terminal" as well which brings one runegate from each set into mutual proximity, allowing you to "change tracks." In addition, each runegate will also have three permanently opened law (white), chaos (rainbow) and death (black) portals to, respectively, the Law Gate (if it exists), Maelstrom and Oblivion.
Within each set, use the appropriate power on your current runegate to create the portal you need. Using the power of the runegate you are standing on will have no effect unless otherwise noted.