Amko
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In my opinion, the magic schools don't have enough spells. I suggest coming up with new ones for each school.
For example, Dark Magic level 3 - Sense of Death, for each creature killed in the squad, damage is dealt equal to 1, 2, 3, 4, depending on the magic skill.
Chaos Magic level 4 - Thunderstorm, deals damage in an area of 4*4 with strength and duration depending on the spellcasting skill. Damage is dealt before the hero's turn begins.