d647950c_d___Game_Guide_and_Walkthrough__BONE_CHARM_PROPERTY
[BONE CHARM NAME] Vengeance [USEFULNESS] It is a good idea to turn your interest to this charm if you often engage in open fights [BONE CHARM PROPERTY] 
As you take damage, your mana increases.
Bone Charms - list - Collectibles - Dishonored - Game Guide and Walkthrough
BONE CHARM PROPERTY