"Eleusis is an actual town in Greece, where the Eleusinian Mysteries were centered. So, you all know Elysium? Those of you who have listened to the Steampunk Opera will be more than familiar (and just WAIT til we get to the Atompunk Opera). Elysium is the final resting place of the virtuous. However, it was also specifically a netherworld realm, located in the depths of Hades beyond the river Lethe. Its fields were promised to initiates of the Mysteries who had lived a virtuous life. In Delville’s worldview this would of course be a transcendent place where the purified initiate might arrive at their destination." (https://steampunkopera.wordpress.com/2013/07/20/the-art-of-esoteric-symbolism-jean-delville/)