d647950c_d___Game_Guide_and_Walkthrough__BONE_CHARM_PROPERTY
[BONE CHARM NAME] Clockwork Malfunction [USEFULNESS] A charm that is virtually useless for those, who remain in shadows. You can ignore it even if you occasionally participate in fights. [BONE CHARM PROPERTY] 
Grenades thrown by your enemies take slightly more time to explode.
Bone Charms - list - Collectibles - Dishonored - Game Guide and Walkthrough
BONE CHARM PROPERTY