*NOTE: Recommended Level is 40.
Obtained: When Eleonora reaches Stage Rank 7, she will send you a Topic. After you read it, travel to the Classroom Film Set and speak with her.
To get more familiar with scary places, travel to the Idolasphere at Daiba Studio and defeat 6 Regans. I found the Regans in the LCD Panels Room on the walkway with the skull Mirage. Once you defeat 6 Regans, a trio of Blairs (taller Regans) will appear with the sixth Regan’s defeat. Defeat all 3 to trigger a cutscene then head to Bloom Palace to unlock Eleonora’s Radiant Skill “Door of Purging”.