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The River Styx was a river in Greek mythology which formed the boundary between Earth and the. It circles the Underworld nine times. The rivers Styx, Phlegethon, and Acheron all converge at the center of the underworld on a great marsh.
The gods respected the Styx and swore binding swearing on it. Zeus swore to give Semele whatever she wanted and was then obliged to follow through, resulting in her death. Helios similarly promised Phaëton whatever he desired, also resulting in his death. Gods that did not follow through on such an oath had to drink from the river, causing them to lose their voices for nine years. Then, being exiled from the council of gods for nine years after that. According to some versions, Styx had miraculous powers and could make someone immortal/invulnerable. According to one tradition, Achilles was dipped in it in his childhood, acquiring invulnerability, with exception of his heel, by which his mother held him.