Across the river Styx, the "hateful" river that circles the realm of the underworld, the ferryman Charon transports human souls to Hades. The gods swear their most dread and unbreakable oaths by invoking the name of the river Styx. Stygian describes something to be linked with the infernal regions of hell, something gloomy, or inviolable.
Comments: Stygian