Moving Silently (GAP)

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Since there's no air, movement makes no sound (not even a "whoosh!"). This means it's really easy to sneak up on someone. A character can move through the plane without actually making any physical movements. That is, without moving a body's arms, legs, or whatever, he can still move from one place to another - so, body rigid, moving through the plane, a traveler makes absolutely no noise even when wearing metal armor or carrying a bag full of gold coins. The downside is, if a body is spotted while trying to move in quietly, there's no cover or shadows to hide behind. So, a rogue's move silently ability is virtually always 100% (some DMs may wish to rule that it is 99%, always allowing for a small chance of error), but his hide in shadows chance is almost always 0%.
Dungeon Masters should note that all characters, even those in heavy metal armor, have the ability to move silently at 100% (or 99% at DM's discretion), since without gravity, air resistance, or momentum, armor never makes a sound unless the character purposefully moves in such a way to make noise. So in the Silver Void, it takes no skill or knowledge to move silently — in fact, just the opposite.