Uncle Zack is a Quest NPC.
Suggested level: 30
Location: Neptune's Temple (235,51)
Mission briefing: In ancient times, Pandora made Pandora's Box and kept it inside Neptune's Temple. Uncle Zack always wanted to study the secret of Pandora's Box, and finally he discovered the secret of how to open it. In order to find out about this secret, you have to complete Uncle Zack's mission first.
Demon Refining Secret (Level 30~32)