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During the 5th century BCE a waterfall in Arkadia's Golden Fields region was named the Waterfall of Styx after the river and the deity. It was believed to be the source of the legendary underworld river, as well as harmful to humans, livestock, and objects.
- According to the story, Achilles' famous invulnerability was the consequence of his mother Thetis dipping him into the waters of the river Styx in his childhood.
- Assassin's Creed: Revelations – The Lost Archive (first appearance)
- Assassin's Creed: Unity (mentioned only)
- Assassin's Creed: Odyssey – The Fate of Atlantis: Torment of Hades