Basic Blade Mistress Information:
Mastery Skills were added in January 2005 update, they are the a variation on "Fighter Skills" designed to be build up slowly over time, giving a minor damage boost to players who are active in training their weapons skills.
There are the following skills:
You gain one XP point in the relevant mastery whenever you strike an enemy with a weapon. You gain no XP for a miss.
Upon levelling, your damage will increase by the amount used with the following formula.
<mastery level> x <physical stat> / 2
Upon reaching level 2 on a 10/1/1 you gain 10 damage useing the weapon matching the mastery.
Experience per level
At the moment, each mastery level is 100k xp. It's currently unknown how much each Mastery level adds to your Character Level.