Magister Sidra:
The "Orb of Abyss" that you carry is a token that shows you have completed all requirements and are eligible to become a Shillien Oracle. Take the orb to a grand master of the Dark Elf Guild and he will give you help in obtaining the enlightenment regarding the truth between light and darkness and thereby becoming a Shillien Oracle. If you go to Grand Master Tobias just over there, you can change your profession immediately.