Tactics against Necromancers.

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!