This Pandoric looks like a stained glass cathedral adorned with images that suggest king Arthur. The title of Elsinore was made famous in Shakespeare's Hamlet was based off of castle Kronborg in Denmark. Legends tie King Arthur to this castle and to the king Holger the Dane who was taken to Avalon and sleeps until he is called upon again to save his people.
...it looks like something that belongs in a cathedral. How is this connected to the grail?"
Professor M. Hogarth
...he was sealed down there centuries ago. He does not die, he sleeps, waiting for the day someone will solve this and set him free."