Two figures moved cautiously to the bank of the river Styx.

Thunder walked in the clouds and the water had gone black as the river Styx.

The river Styx, he recalled, drove away memories of the living.

Perhaps we can aid you, help you return to the river Styx.

In the river Styx the wrathful fight each other on the surface.

Like, when we got there, we'd see a road paved with good intentions and have to cross the river Styx to get in.

To get there, the dead needed to cross the River Styx.

When darkness descends you shall once more be on the river Styx.

"It's what I would expect the river Styx to look like."

It was dark as the depths of the River Styx.