Mongol
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You need to not only collect the artifacts but also give them to the prophet.
Well, you're hurting my feelings, I'm not that stupid :D (I have years of experience with Heroes 3, and before that, 1 and 2 ;) )
That's exactly what I'm saying – I completed the special quest, but when I came back and said, "Here are the boots, armor, hat, and shield," the response was complete silence.
I thought, maybe I need to bring Fedor (Taramapampam was collecting the artifacts for me), but again – complete ignorance, as if saying, "I don't know you, what do you need, Fedor?" :D
So, I thought that I was missing something, and I overlooked some mace in the dungeon.
Based on what you're saying, it seems I collected everything. So, it must be a bug.
Or maybe I was barging in through the window? :)))))))))))