"Everything in the Necropolis is classic and shouldn't be changed" - this is what you hear everywhere, but you also shouldn't be able to touch the dragons. I think it would be better if the griffin dragons were turned into death knights; they would have higher stats and be excellent ranged units. Or, you could create some kind of death worms, like the ones in the second installment, that could poison either all enemies or one enemy of your choice, but be stronger. And if they attack a poisoned enemy again, the effect of the poison would be amplified. If they attack in melee, they could bite the attacker.