The Astral and the Ethereal (PWH)

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The Astral and Ethereal form the great highways of the planes, the infinite paths that connect all other planes. Essentially, they're the spaces in between. Most planewalkers don't think of either plane as much more than a path to be traveled to get where they're going. If a body stopped to look around, though, he'd discover much more to these planes than that.
* The Silver Void
* The Misty Shore