Skill: score criticals.
This skill is almost impossible to learn.
The skill is automatically in use.
By fighting your opponents with normal hits does cause damage, but critical hits differ from normal hits so, that the damage caused is more devastating. With luck, any character is able to hit a critical hit to vital body parts. This skill however, is a measure of knowledge about those vital parts of body, and most importantly, how to deliver your hit. Therefore you will hit criticals more often and cause more damage when so, too.