From
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http://www.mmorpg.com/gamelist.cfm/loadNews/6177
In Chronicle 5: Oath of Blood, every class in Lineage II has received a new skill or a change to an existing skill to enhance Player vs. Player combat. Almost 50 new skills have been added in Chronicle 5, beginning at level 46, to introduce new and challenging tactics to defeat an opponent.
Each class belongs to an overall group, and a balance was established between the five groups. Within the fighter classes, the three groups form their own balance against each other. These melee groups can be vulnerable to Damage Dealing Mystic classes, but are superior to Healing/Buffing Mystics in combat. Healing/Buffing Mystics also have new abilities at their disposal to effectively combat the Damage Dealing Mystics.