d647950c_d___Game_Guide_and_Walkthrough__BONE_CHARM_PROPERTY
[BONE CHARM NAME] Tough Skin [USEFULNESS] Wear this charm only if you opt for aggressive gameplay. [BONE CHARM PROPERTY] 
Extends the health bar.
Bone Charms - list - Collectibles - Dishonored - Game Guide and Walkthrough
BONE CHARM PROPERTY