PhaseWalker

Phase Walkers are beings similar to Humans. The one thing which sets them apart is their ability to shift into a different plane of existence. This plane, known as the "phase plane," being a pocket dimension of sorts, is a mirror of the current world which the Phase Walker inhabits. Phase Walkers are the only ones able to access these planes. Other beings are only able to access this plane through the assistance of a Phase Walker. In addition to requiring the help of a Phase Walker to get in, one must also be assisted by a Phase Walker to get out of these planes. Make sure to exercise extreme caution when working with these things, as you may end up stuck somewhere you didn't want to be.