Avl8
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Based on my experience in the Anastasia campaign, the main goal is to get a level 15 mage hero. And from level 10, start saving skill points.
Once you reach level 15, take the following combination:
Water Elemental + Water Magic to increase the number of elementals + Meditation for mana regeneration.
From this point on, practically ANY group of monsters can be defeated without losses. This is especially useful at the beginning of new missions, when you have a minimum number of troops, but need to quickly capture mines, forts, and enemy strongholds.
How does this work?
It's very simple. On the very first turn, summon water elementals NEXT to the monsters. So that each group of monsters can reach the elementals and attack them.
The elementals have a lot of hit points, high initiative, and Ice Bolt every two turns = movement control.
The task of the hero and our archers is to kill as many monsters as possible in the next 3 turns. Because then the elemental summoning cooldown will end, and you can summon fresh reinforcements.
Meditation is useful for mana regeneration - during each hero's turn, you need to summon 2-3 packs of elementals, and the initial mana regeneration will not be enough.
IMPORTANT: your army must have at least 1 unit with high initiative - or a combination of initiative rings and the Ambush skill, which increases initiative by 5 in the first turns of combat.
Otherwise, the neutrals will go first and may reach our small troops.
I completed the last two Necromancer missions using this method with minimal losses.
What's nice is that there should be many more similar tricks in the game