LETHE AND MNEMOSYNE:
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click for larger version Sailor Lethe and Sailor Mnemosyne appear only in the manga, in Act 48, Volume 17. Eternal Sailor Moon, Princess Kakyuu, ChibiChibi, and the Starlights enter Zero Star Sagittarius, and come across a vast desert. A dark, robed figure appears in a boat with an oar, and introduces herself as Lethe, the ferryman of the desert river. The senshi board the boat, and the sand around them begins to liquify. Suddenly, the boat sinks, and Eternal Sailor Moon finds herself in her civilian form at the bottom of the River of Oblivion. Lethe confronts her and asks her personal questions, but they confuse her - Usagi has forgotten who she is, where she is from, and who her friends are. She can only look on blankly as Lethe kills Luna, Artemis, and Diana, having no recollection of who the cats are. She tells Usagi that those with life are born to die, and attacks her with "Galactica Mysotis Alpestnis." Mnemosyne runs to the scene and pushes Lethe, stopping her attack. Mnemosyne says that Sailor Moon has been hurt enough, and that her fate should be left to Galaxia. Upon hearing the name "Sailor Moon," Usagi remembers who she is and why she is there, and transforms into Eternal Sailor Moon. She swims through the sand, and sees the Starlights, Kakyuu, and ChibiChibi. Mnemosyne forms a protective click for larger version sphere around the group and leads them to dry ground. She gives Kakyuu water from the River of Memory to revive her and bring back her memories, saying that she doesn't want Sailor Soldiers like herself to be hurt by Lethe. It is then revealed that Lethe and Mnemosyne are the senshi of the planets Lethe and Mnemosyne, respectively. Their planets were small, poor, and plagued by violence and chaos. Galaxia appeared and brought death and ruing to the planets, and the two had no choice but to follow her in the hopes of someday finding peace. Lethe says that Sailor Moon's Sailor Crystal, the Ginzuishou, is the cause for all of the wars they are experiencing, and that if it is destroyed, there will be peace. Sailor Moon offers her life if it will end the violence. Lethe and Mnemosyne are so moved by her self-sacrifice that they realize that whether or not Sailor Moon dies, the war will continue. Just as they are about to release the senshi, Sailor Chi and Sailor Phi appear, calling them useless fools and taking their Sailor Crystals, killing them. Lethe and Mnemosyne can be distinguished because Lethe wears a darker green dress, while Mnemosyne wears a lighter pink dress. Lethe appears harsher and more cruel than Mnemosyne, who appears softer and more feminine. Their facial features compliment their personalities. The two are often called the Desert River senshi, because the guard the desert rivers of Oblivion and Memory. The Materials Collection states that the two are twins.