In The New Age, other than the normal skills players could learn, there was this thing called the 'Mystic Skill Book', also known as Skill Set or Combo Skills.
At level 40, players could get the Mystic Skill Book based on the difficulties they chose for the theirJob-Advancing mission. Basically, a Mystic Skill Book allowed players to learn the entire set of skills with bonus effect instead of the usual single skill.
Bronze Mystic Skill Books contained 2 skills.
Silver Mystic Skill Books contained 3 skills, so on and so forth. Legendary Mystic Skill Books contained 7 skills, which made a distinctive difference.
For example, Pink Mosquito and Rainbow Bug had learned the Giant Wood Control Spell, which was a Silver Mystic Skill Book. It contained the following 3 skills: Wood Binding, Wood Judgment, and Wood Enhance. All these skills would have a bonus 50% effect due to the secret book.
