d647950c_d___Game_Guide_and_Walkthrough__BONE_CHARM_PROPERTY
[BONE CHARM NAME] Swift Shadow [USEFULNESS] It's one of the more useful charms for a player who constantly stays in shadows. It allows easier movement between locations occupied by enemy units. [BONE CHARM PROPERTY] 
Faster movement if you stay in shadows.
Bone Charms - list - Collectibles - Dishonored - Game Guide and Walkthrough
BONE CHARM PROPERTY