Answer:

STYX

Answer	Crossword Clue
STYX	River of Hades
STYX	Charon's crossing
STYX	Underworld river

STYX	"Show Me The Way" band
STYX	River next to Hades
STYX	Where Charon rowed
STYX	"Mr. Roboto" band
STYX	River around Hades
STYX	River of ferried dead
STYX	Charon's river
STYX	River of Hate, in myth

STYX	Milton called it "the flood of deadly hate"
STYX	It goes around hell
STYX	Souls of the dead cross it
STYX	The "river of Hate"
STYX	It's dubbed "the flood of burning hate" in "Paradise Lost"
STYX	Site of a mythological ferry service
STYX	The souls of the dead crossed it, in myth
STYX	River circling the underworld

STYX	Infernal river
STYX	"Show Me the Way" rock group
STYX	Netherworld river
STYX	River encircling Hades
STYX	"Divine Comedy" river
STYX	Earth-Hades boundary, in Greek myth
STYX	Underworld ferryman's post
STYX	Netherworld flower

STYX	River crossed by Orpheus
STYX	Site of Charon's ferry
STYX	Charon's waterway
STYX	Final crossing?
STYX	Runner down under?
STYX	"Paradise Lost" river
STYX	River down under?
STYX	River to the underworld

STYX	Where the last ferry leaves
STYX	One hell of a river?
STYX	River in which Achilles was dipped
STYX	River of the underworld
STYX	"Show Me the Way" band