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Aha! Now the question of "weaver or spinner" is clearer to me.
A transformation from liches to vampires? Unlikely. And the spider web is really too cliché – something like that already exists in King's Bounty. And the transformation of liches into vampires also reminds me of the ability of goblin shamans... Although, considering that Black Hole borrowed many ideas from King's Bounty, it's quite possible. Unfortunately :(. What irony: first, Katauri copied half of the ideas from "Heroes 5," and now the developers of "Heroes 6" are catching up with ideas from King's Bounty...