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I'm still playing the map in version 2.0.0 with the Necromancers. I'll share my impressions when I reach the end.
For now, I'll talk about the suggested main hero, Dexter. On this map, he seems weaker than any standard Necromancer hero. I tried playing with him in versions 1.0.2 and 2.0.0 across two restarts – it was all very sluggish. There are several factors. First, there's no "Raise Dead" spell. In the early days, the main force of the Necromancers is skeletons; if you manage to raise ghosts, it's even better. Zombies, due to their low initiative, are just a meat shield. The AI isn't that bad; it takes out the skeletons in a few turns, and then, when the "Vampirism" effect ends (remember, this is the beginning of the game, and the spell lasts for 3-4 turns), it starts targeting the zombies. As a result, from battle to battle, the actual strength of the Necromancer's army doesn't increase because only zombies remain. If you play with skeleton archers, the AI effectively breaks through the zombie shield and deals damage in return. Then, it eliminates the skeletons. The archers are weak, and the neutral creatures on the map are strong – they won't inflict critical damage. Even a battle with Harpooners looks bleak. Dexter is still somewhat usable if he learns "Slow." Despite the fact that there are many altars, I only got it 2 out of 5 times. (All spells are randomized, and they often repeat). The second point is that, with a good "Darkness" skill, you can try your luck in the magic tower. Resources are scarce, but you can manage to reach level 4 (in a couple of weeks – after that, all the opponents will arrive), but you'll have almost no army. It seems feasible, but the Necromancer (in my case) arrives first, and the battle is based solely on the size of the army, and "Vampirism" on zombies and "Berserk" – it's all in vain.
Dexter is somehow associated with the Barbarians. This is another problem – it's difficult to find your own heroes in the tavern. When, during another restart, Lucretia appeared in the tavern, I took her (I wanted to use her to learn "Raise Dead"), started developing her, and was surprised at how easy it was: she develops quickly, and the opponents aren't scary at all (they're not chasing my main hero, but she's chasing them). And Dexter wanders from shelter to shelter with zombies: fetch and carry.