possotop
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As for the Sword of Vengeance and the Unnamed Staff, I can't help you. I think I got them on the 4th map of Inferno, maybe they are given for pre-ordering or for the full version of the game, because I completed the campaign for the Elves and almost the entire campaign for the Necromancers, but I haven't encountered these weapons yet.
If you have already "farmed" these artifacts, you might have missed their issuance. I had something similar happen: I knew that I would receive another artifact in the campaign that I already had, and I was worried about what would happen to it. The experience on it remained the same, so nothing indicated that I was given a new one. So, it's quite easy to miss the moment of receiving such an artifact.
