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I didn't quite understand something about the assassins and so on. It's clear that the Demon acted and killed two of them immediately (see the description), but what the priest did is unknown, because he moves before the "Shabash" (a term for a gathering of witches or warlocks) does.
If we look at the picture, it immediately reminds me of Pandora. The avatar also has lilies and other vegetation.
By the way, the artwork was drawn with charcoal, because the artist was at the scene of the crime and apparently picked up one of the charcoal pieces right there.