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You're thinking along the right lines.
I can add that about 30-40% of the artifacts are based on artwork from the fifth installment.
I also noticed that the heroes' names are a mishmash of names from all the previous games in the series. In some cases, even the city names are the same.
I don't know, maybe this is a subtle reference to the previous games, but for me, it's more like a patchwork and a lack of original ideas.
