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At some point during the Peloponnesian War, Orphnaeus was discovered in Elysium and not his home-realm of Hades. Persephone tasked Kassandra, a living human, to retrieve the beast. Kassandra eventually found him not too far away in the Asphodel Arboretum with a man named Mulios, who had nicknamed the beast 'Orphie'.
- The name of the steed is derived from the Greek word ὄρφνη (órphnē), meaning 'darkness'.
- The names of Hades' mounts are taken from the Roman poet Claudius Claudianus' work The Rape of Proserpine.
- The player has four choices on what to do with Orphnaeus;
- Let Mulios keep him
- Kassandra keeps him
- Give to Adonis and his rebellion
- Give to Persephone