We had a few references to Greek mythology these season, so I wouldn’t be surprised if we gonna see Hades in the next one.
But I also agree that the Arthurian legends could be kind of interesting. I would really love to see Merlin, Avalon and Morgana le Fay on the show.
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“There were thousands and thousands of forms of joy in the world, but that all were essentially one and the same, namely, the joy of being able to love.”
— from the Neverending Story by Michael Ende