Critical hits are attacks that deal 200% of the damage your basic attack or skill would have dealt, while restoring 1 Rage Crystal instead of 0.5 of a Rage Crystal that a non-critical would give.
How to get CriticalEdit
Critical can be obtained by wearing equipment that gives Critical such as Spider Silk Bone Armor or a Hair Feather. Critical can also be obtained by Rangers with the Sharp Eye skill. It is said that every 1 Critical equals to 1% critical hit chance, but this is only speculation.