The Underworld

crossing the Styx (idiom)

Passing a point of no return, especially into death or an irreversible change.

the river of no return

to descend into Hades (idiom)

To enter a dark, frightening, or hopeless situation, often to face something you dread.

down among the dead

drinking from Lethe (idiom)

To forget completely, as if wiping away all memory of something.

the water of forgetting

tantalize (word)

To tease someone by offering or showing something they want, then keeping it just out of reach.

punished just out of reach

a Sisyphean task (idiom)

A task that is endless and futile, because it must be repeated forever without ever being finished.

the endless labour

the Fates have spoken (idiom)

A decision has been made that cannot be changed, as if it were destiny.

the thread that cannot be undone