Kai-Yusav Naihara (alternately, Kai'zav) is an Alxerion encountering in the Alphalace. She is level 495. Kai-Yusav was originally created by the Supreme General to govern Varieleis although he managed to seal her in a capsule in a locked room to empower her up in which he say that he wanted her to be sharp as a knife when she strikes. Yet curiosities among wandering Encivils strive about the room, according to them, it was being engulfed by a "repulsive aura". Until Alicia II (Leaviel Zeryon) became an Alxerion as a head of the subclan, Kai-Yusav's capsule was broken by the shockwave she casted, implying that she got the fullest power possible. She had left the room by herself.