After reaching Level 60, the Headmaster starts a conversation with you.
The Headmaster says that you need to participate in a Special Training Field Trip and that you to meet your teacher in class. It must be another Resistance mission! Hurry to the Underground Base and talk to Brighton, the Battle Mage Job Instructor.
You have a new, difficult Resistance mission that must be completed at the Power Plant, the hideout of the Black Wings. Although it will be tough, you have no desire to forfeit!