Luna Nox is a Bashai princess from Nihil's Throne, the younger sister of Sola Nox, and was the research subject for the SoulDreg Queen Project. She currently leads the Army of Dark Blue and was the primary cause of Dipluce Horizon's destruction and the source of overflowing SoulDregs in Candus City. Very little is known about her personality. She calls the SoulDregs her children. Her eyes turned red as a result of the SoulDreg Queen experiments.

Luna Nox is the daughter of Xe Nox who was kept under upmost secrecy in Nihil's Throne along with her older sister and assigned Edgar as her bodyguard. Edgar fell in love with Luna and continually tried to make her smile leading him to bring her toys, candies, and Edgar himself dressing up as a clown. Xe Nox caught word of Edgar's strange behavior and exiled him from the kingdom. Shortly after, the Great Void appears and Luna ended up on Second Stair.

However, Luna was separated from Edgar and only a few guards with her. Unforuntely, Henryk's force was able to subdube her guards and she ended up as the research subject for the SoulDreg Queen project, an experiment that attempted to the essence of Nihil Throne's SinForce to control SoulDregs. Due to her missing presense, Sola Nox's faction was able to take control of Nihil's Throne. She eventually goes berserk turning the researchers into SoulDregs and made Dipluce Horizon into a living hell. Much of her life after the experiments is unknown but she was supposedly treated as a Saint by the Vacuum Fanatics who were part of the experiments whom where also turned into SoulDregs. At some point, she encounters Oculus's corpse and resurrects him as a SoulDreg.

Edgar was able to unite with her, who she is unable to recognize at first and the two escape together. She and Edgar challenge the SoulWorkers as an effort for the SoulWorkers to join them but lose the duel. After losing the match, she and Edgar escape somewhere in the Northern Grace Region.