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I remember looking at Inferno in Heroes of Might and Magic III and immediately understanding that these were demons – specifically, biblical demons, not the generic ones that are churned out in every fantasy setting.
And they inspire more fear. It's much scarier to face the Lord of the Pit from Heroes of Might and Magic III than any demon from Heroes of Might and Magic V.
(It's a shame they weren't implemented very well in Heroes of Might and Magic IV).