The drink offering in this scene is quite inspired by the necromancy of Odysseus in the Odyssey. There Kirke tells him to pour a libation of milk and honey, then of wine and water, to the dead. He also promises to sacrifice a wholly black sheep to the dead Teiresias when he gets home.
When people pray to the underworld deities in the ancient texts, they often bang their hands against the ground. Maybe to make sure to be heard, I don't know.
The ancient Greeks avoided to mention Hades' name if they could. As a result he was called by a number of euphemistic names and epithets, like Ruler Of Many and The One Who Receives Many.
And, yeah, the priestess' name is Melito. I just picked the name out at random.
I am LOVING the research notes! Only at page 3, but this looks really cool so far ^^
Thank you very much! I hope you will like the rest as well. ^^