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Generally, I have this tactic.
The main hero is Tant or some kind of Death Knight. He travels with liches, purchased as early as possible, skeletons, and you can also include knights. The main task is to destroy the enemy, conquer territories, and do all sorts of cool things (also, fanatically recruit skeletons). You need to develop any necromancer into something between a mage and a warrior. The second hero can be from any castle, and vampires are raised for him from the first week. By the third week, he turns into a completely independent hero for clearing territories, and with proper use, he can capture Dragon Utopias. Everything related to neutral monsters is his job. There are also a lot of units left that can be used for anything, from fully defending the castle to creating a third serious army with 2 flying units (effective against castles). The problem with necromancers is that they are difficult to start with, but considering the low cost of the castle, it's not that bad. As for magic, earth is enough... Because slowing down is also a form of speeding up, but in reverse. And tactical tricks like "it takes too long to get there - they'll shoot you down" are offset by the number of skeletons.