Mastery: Critical Block

Mastery: Critical Block is the Mastery of protection warriors, improved by the mastery secondary stat. It increases the warrior's chance to block and critically block incoming attacks.

Critical block chance is a subset of 'normal' block chance. If a warrior has 50% block chance and 30% critical block chance it means that 15% of all attacks will be critically blocked and 35% will be 'normally' blocked.