Ethereal
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However, Zephyr is as related to the original Heroes of Might and Magic II as Tactics is to the original Fallout.
In fact, yes. In essence - no. I can't say anything about Zephyr, I haven't played it, but Fallout and Tactics are still different things. Fallout 3-4 have nothing to do with the series at all. These are products of Bethesda's long digestive process and are entirely on their conscience.