Weapon Specialization is a new system that allow you to get passive bonuses and new skills.
Aura Kingdom get Weapon Specialization Skills
Very detailed guide on English here

Looks like all new and some old x-legend games going get that system, it made huge changes for some classes -

Wizard Right Path
Video with skills demonstration

  1. AOE nuke skill


    • Increase meteor damage by 4%, meteor becomes chargeable. Half charged deals 50% more damage fully charged deals 120% more damage

    • Instant thunder no longer dashes to target, but explode around your target

    • Once path level reaches lv30 or higher, increase meteor damage by 6%; explosion from instant thunder deals more damage


    • Increase crit by 7%

    • Once path level reaches lv30 or higher, increase crit by 9%
Ravager Left Path

  1. Multi-Hitting skill


    • Increase flame slash damage by 10%, successful hit will summon one flying axe dealing damage

    • Increase horizontal slash damage by 6%

    • Once path level reaches lv30 or higher, increase flame slash damage by 15%, summon two flying axe; increase horizontal slash damage by 8%


    • Lower rage decreasing speed to 5 rage points per second

    • Once path level reaches lv30 or higher, lower rage decreasing speed to 4 rage poitns per second
Grenadier get most cool skills in a game - summon robot!

Summons a giant robot. 20% of your damage and 40% of your HP will be added onto the robot.