d647950c_d___Game_Guide_and_Walkthrough__BONE_CHARM_PROPERTY
[BONE CHARM NAME] Ox Blood [USEFULNESS] A very interesting charm that is worth getting regardless of the preferred gaming style. A longer mana bar makes for a more frequent and more convenient use of powers. [BONE CHARM PROPERTY] 
Extends mana bar.
Bone Charms - list - Collectibles - Dishonored - Game Guide and Walkthrough
BONE CHARM PROPERTY