Um in retail more than meet the eye quest is a requirement to learn certification skills proof is right here also its a must do quest thats why i said unless u disable the requirement here.http://www.lineage2.com/news/hellbound_01.html
Adding New Skills
While in your subclass state, go to your corresponding subclass master NPC and get your subclass ability certification.
Take the certification to the Avant-Garde NPC in the Ivory Tower to acquire the corresponding skill.
You can acquire the skill only while in your main class state. There is no main class level requirement to acquire these skills.
None of the subclass certification items you receive can be dropped, destroyed, exchanged, or stored in a warehouse.
The number of subclass skill certifications is restricted, so you must make your decision carefully. For example, if your first subclass receives a skill certification at level 65, even if you subsequently delete that subclass and raise a new first subclass to level 65, you cannot receive another skill certification for your first subclass at that level.
You must complete the “More Than Meets the Eye”
transformation quest in order to receive the subclass certification and to properly acquire the skill as your main class.
The special subclass-determined skills you can acquire are as follows: