Discussion about Dungeon (Dark Elves).

Hi everyone! I've been playing Heroes since the third installment, and I only play as the Dungeon faction because I think they're the only ones that are any good. Plus, they have cool faces. Anyway, I'm a die-hard Dungeon player. I'd like to discuss how to deal with the Necropolis faction, especially Deleb and Hafiz. They wouldn't be such a big problem if the Blood Queen always had the "Deadly Chill" spell, but I try to play only with her because it's the easiest way to level up. By the second week, I'm already level 11-13, I have level 4 spells, and about 30 Furies and Harpies, but then Hafiz shows up with 180 Gnomes and 6-7 Archmages and a BALLISTA. So, I first attack him with Harpies, and I don't always even have time to turn invisible because the ballista, the mages' Fireball, and the gnomes often go first. I do split my Harpies into groups of two, though. Maybe I shouldn't split them up, but instead turn invisible with one stack of, say, 30 Harpies, tear through the mages and gnomes, and then retreat, and in the next battle, just finish off the enemy? This strategy works well against, for example, Orcs and the Undead, but not against Deleb. With Inferno, the Summon spell reveals invisible Harpies even before they get to move invisibly, because the Imps and Cerberus have higher initiative than the Harpies. Or am I doing something wrong? What do you guys think about all this? How can I reliably crush the Necropolis rush and send them back to the depths of Inferno?