Posts from Tactics against Necromancers.

It's possible in other ways.
Since elementals cannot be raised or drained by a vampire, and levels 4-7 have immunity to Armageddon, you can use Armageddon to attack them.

I'll see how many elementals you can accumulate.
+ Necropolis can develop 20% magic fire resistance.

Well, and thirdly, there are many of us (especially skeletons). Even 7 Black Dragons will have to struggle...

See the balance topic. That is, if a faction is strong in one area, it is weak in another. However, if the player is knowledgeable, they will use their strengths to cover their weaknesses so well that you can't even get close to them... It's all about the DNA!

I think there is no general tactic against Necropolis, because Heroes is not tic-tac-toe, but a multi-directional, multi-strategic game. Each player has their own strategy, and you can look for a counter-strategy against them, but this is individual, or, at worst, it can be related to the strategy of a group, but not the faction!

Conflux is a decent castle, but with its own quirks. It's a real counter to Necropolis.

But what is it for? :)

With such powerful magic, any spell is good.

That's good, but then you also need to consider the "Deadly Wave" spell, which, with the same level of magic, deals significant damage to all living creatures. It's better to protect yourself from this by slowing down the enemy or using a prayer on your own units, so that you can move first and prevent them from casting the spell.