Styx, Lethe and Pasithea

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Lady Styx a goddess and a river that formed the boundary between the Earth and the underworld also known as Hades. The rivers Styx, Phlegethon, Acheron, Lethe and Cocytus all converge at the center of the underworld on a great marsh which sometimes  was also called Styx. The Gods are bound by Styx and swore oaths upon Styx. During the Titan war Lady Styx sided with Lord Zeus as a result Lord Zeus promised every oath be sworn upon her. Lady Styx is the daughter of Lady Tethys and Lord Oceanus, wife to Lord Pallas and mother to Lady Nike, Lady Bia, Lord Kratos and Lord Zelus.

Lady Lethe a goddess and another river of Hades. Lady Lethe flows around the cave of Hypnos and through the underworld, where those who drink from it forget everything from the their earlier lives on earth.

Lady Pasithea one of the three Charities and the Goddess of relaxation and meditation. Daughter of Lord Zeus and Lady Eurynome. Wife of Hypnos promised to him by Lady Hera and mother of the Oneiroi.