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It's not difficult to raise a thousand skeletal warriors. And they can hit almost as well as zombies.
I don't think Necropolis is that impossible to defeat. Although, even with the introduction of Dark Energy, they significantly outnumber their opponents. But not in quality.
Now, let's look at the new necromancy system. In fact, a Necropolis hero will be able to raise reinforcements during battle and leave some of them in the army. That is, there will be more than seven stacks on the battlefield. In my opinion, this will be more unbalanced. But, most likely, the number of "raised" units will be severely limited. And, I think that magic will be a worthy countermeasure. Surely, the "Summon Phoenix" spell will remain. In general, the developers will somehow balance it.
The balance was also carefully adjusted in "Heroes of Might and Magic V". It's just easier to play with some factions, and more difficult with others. Ultimately, it still depends on the player's skill. In multiplayer, you can also prevent your opponent from developing ;).
I don't think Necropolis is that impossible to defeat. Although, even with the introduction of Dark Energy, they significantly outnumber their opponents. But not in quality.
Now, let's look at the new necromancy system. In fact, a Necropolis hero will be able to raise reinforcements during battle and leave some of them in the army. That is, there will be more than seven stacks on the battlefield. In my opinion, this will be more unbalanced. But, most likely, the number of "raised" units will be severely limited. And, I think that magic will be a worthy countermeasure. Surely, the "Summon Phoenix" spell will remain. In general, the developers will somehow balance it.
The balance was also carefully adjusted in "Heroes of Might and Magic V". It's just easier to play with some factions, and more difficult with others. Ultimately, it still depends on the player's skill. In multiplayer, you can also prevent your opponent from developing ;).