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I don't even remember that spell; probably because I only play as Necropolis. Does this spell deal a lot of damage to undead units? Or is it like in Heroes 3, where it's not very effective?
It doesn't deal that much damage... it's not worth 5 mana points... 3 at most...
Necropolis is definitely the strongest faction in Heroes 5, and the only one that stands out among all the other well-balanced factions...
but I rarely play as it because it feels like cheating and it's not interesting... there are no challenges... especially if you start playing as the Resurrector...