First class mastery books were different from normal mastery books and advanced mastery books. They usually represented highly combative skills characteristic of first class professions, and their effects were much more potent than those of normal skills, but their cooldown periods were not as long as those of the advanced skills.
Nie Yan continued to dig through the Dark Gold Treasure Chest but didn't find anything else. He did, however, pull out a first class mastery book—a Great Thief mastery book.
Mastery Book: Backhand Stab (Freedom Skill)
Skill Description: The thief uses bodily movements to dodge the opponent's attacks, comes with two seconds of invincibility, moves to the enemy's back, and inflicts enhanced Backstab damage.
Stealth Requirements: Movements (requires weapon), 50 rage bar points
Skill Attributes: When hitting an opponent, obtains an additional 100%-300% attack damage, armor-piercing damage.
Skill Cooldown: Thirty seconds.
