Increases the attack value of your martial arts weapon by 10% per level of mastery. This is a percentage increase, not a flat value increase. If your attack value with your weapon is 10, this skill will make it 11. 

The Martial Arts Weapons are:

• Unarmed
• Katana
• Nunchucks
• Rods

Each weapon type is its on skill and you would have to level up each one individually. Just because you have an weapon type unarmed at level 3 you won't also have nunchucks at level 3. When you acquire nunchucks it will be at level 1.

This is a Tier 3 skill

Level 1: 75/150
Level 2: 100/200
Level 3: 125/250
Level 4: 150/300