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The Necromancer is more developed, has more skills, has many times more attack, defense, and magic points, and has an army that is many times larger than yours – he is impossible to defeat. You write that you managed to maintain a combat-ready army. Where did you get an army from? You are not given an army or money at the beginning. Where did you get a combat-ready army in a week? Just open the map in the editor and take a look. Of course, you can use ArtMoney, but that's not the point. Your attack, defense, and magic are all at one, your army is zero at the beginning, and you have no bonuses. Let's look at the Necromancer. He has a Castle and a Vampire Estate. Arantir has cursed land, a scream of horror, 150 archers, 75 zombies, and 60 ghosts. His defense is 9, attack is 11, magic power is 16, and mana is 150!!! He has unholy word, raise dead, and animate dead. Giovanni and Markel are even more powerful. At the beginning of the game, they have 30,000 gold, and you have nothing. Arantir arrives on the second week, and Markel arrives three days later. What can you build in your Castle in a week without money and resources? Peasant huts, and maybe an archer tower. No towers, nothing. How can you win a battle against any of the Necromancers?
Added 4 minutes later
Arantir also has a scream of horror, which he successfully uses on the very first turn. After that, I don't make any more moves.