d647950c_d___Game_Guide_and_Walkthrough__BONE_CHARM_PROPERTY
[BONE CHARM NAME] Unnerving Target I [USEFULNESS] A charm that is useless to someone, who operates from hiding, and moderately useful to someone who engages in open fights. [BONE CHARM PROPERTY] 
Slightly cripples the enemies' ability to wield weapon.
Bone Charms - list - Collectibles - Dishonored - Game Guide and Walkthrough
BONE CHARM PROPERTY