As the fight continues, one-sidedly in Ozen's favor, Reg arrives at the conclusion that only a shot from his Incinerator will be able to beat Ozen. Ozen lives at the Seeker Camp within the 2 nd layer of the Abyss, where she commands a small team of cave raiders known as the Subterranean Bandits. Ozen "The Immovable" is a legendary White Whistle Delver who has made outstanding discoveries of the Abyss and retrieved numerous Artifacts of incredible value. At Ozen's instructions, Marulk gives the two of them Blue Whistles; Ozen notes that it would be troublesome to explain the presence of two Red Whistle Delvers in the Seeker Camp, so for the time being they will wear Blue Whistles. Reminiscing about the Unheard Bell excursion further, Ozen begins muttering cryptically. During their ascension of the stairs she tells Riko several things; Ozen tells her that the letter supposedly sent by her mother was fake, that her mother was dead and buried in a grave in the 4 th layer, and that she happened to have found the letter and the whistle on that grave. She tells them Riko's lack of communication in battle, as well as Reg's lack of being able to judge the right timing to use his Incinerator are fatal flaws that would have them wind up dead sooner or later.