MoZeS
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Overall, not bad. But
1) Removing invisibility from the hunters is not cool.
+1.
It's a useful ability as an alternative to ranged attacks. The early game for the Dark Elves is already challenging, and it won't be possible to cast spells repeatedly without penalty by taking advantage of the small army's invisibility due to the lack of mana, so having invisibility on level 1 creatures with a small bonus for heroes with a little mana is quite justified, in my opinion.
And I fully support some general improvement to the demons.