What is Casualty Rate?
The Casualty Rate represents each item's chance to be destroyed in combat. All items have a Casualty Rate and when the item breaks, you lose the item and it is removed from your inventory. When the rate is 0, the item is never destroyed as a result of combat.
Where does Casualty Rate come into play?
All places where the item is used in terms of combat, such as Attack and Defense in WD, Attack in Epic Boss, Hard Core Boss, Raid boss, and Attack and Defense with Rivals(Rob).