Class Change Levels and rewards can be found in game through the Class menu in the top right Menu list.
When you reach a Class Change Level, you will receive a Class Change Guide quest.
When you complete it, you can change your class to a higher grade.
■ Class Change Levels and Rewards
- Lv10: Uncommon Class
- Lv30: Rare Class
- Lv60: Epic Class
- Lv80: Legendary Class