The River Styx is mentioned quite a lot when a Greek hero meets his demise.
However is this really a body of water in Hades?
Is it made out of something else?
What is the River Styx?
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Once the war was won, Zeus, king of the Olympians, promised that every oath be sworn on Styx's name, as a sign of the greatest respect.
He also proceeded to name the River Styx after her.
Achilles was dipped in it as a child and was rewarded with invulnerability, except for his heel, which was where his mother was holding him, hence the term : Achilles' heel.
The full list of rivers surrounding Hades :