How To Upgrade Your Character Class??

First, you will need to train your character to Lv 150.
Talk to NPC "Priest Sevina" In Devias at co-ordinates "184 32"
You need 1,000,000 Zen to start the Quest.
Once you have started, you will be asked to find the "Scroll of Emporer"
Return to Priest Sevina once you have obtained this item to complete the first step.

Next you will need to Talk to Priest Sevina again to start the second part of the main Quest.

You need 2,000,000 Zen to start the Quest.
Once you have started, you will be asked to find the Required item for your character class,
Return to Priest Sevina once you have obtained the required item to complete the final step.

CONGRATULATIONS!! You have been granted great power, you may now wield better items to make yourself even stronger!!