Critical Hit

Category: Terminology
A Critical Hit is an attack that does more than the usual amount of damage to a monster. 
When an attack scores a critical hit, a different animation is used instead of the normal hit animation. 
The higher an attacker's DEX, the greater their Critical Hit Rate against an opponent is. The higher a defender's AGI, the less likely they are to have critical hits scored against them.
The minimum critical hit rate from DEX vs. AGI is 5%, the maximum is 20%. Equipment and merits that increase critical hit rate are added on top of this.
It is currently believed that critical rate caps out when DEX is 50 points higher than AGI, at least at level 75. 
Critical Hit rate follows an exponential curve. Minor increases in DEX will not have a significant impact on critical hit rate (e.g. DEX+1 = +0.25 critical hit rate). Major increases in DEX increase the rate significantly, whereby DEX+1 ~= +1% critical hit rate.
The trait Critical Attack Bonus and equipment such as X's Knife can increase the damage dealt by critical hits, see Critical Hit Damage for more details.
===See also===
* How critical hit damage is calculated
* Critical hit research
* More critical hit research
* Studio Gobli research (JP)
* DEX/Critical Hit rate relation data