CRIT-HIT

The critical hit skills give a chance of scoring a critical hit. Each additional critical hit skill past "crit hit i" gives a chance of doing greater damage. For example:

crit hit i  ... double damage
crit hit ii ... triple damage
crit hit iii ... quadruple damage
crit hit iv ... quintuple damage

In order to land a higher level critical hit, you must successfully land a lower level one. For example, if you successfully land a critical hit i, the mud then checks to see if you land a critical hit ii. If you do, it converts the double damage attack into a triple damage attack instead. If you land a critical hit ii, it then checks to see if you land a critical hit iii. And so on. Therefore, it is very important to master an earlier critical hit skill before learning the later ones.

The critical hit mastery skills each dramatically increase your chance of landing a critical hit on each attack.

Critical Hits are also very important for Cleaving.