Elemental Forums
I can't tell if I'm missing a toggle somewhere, but without one, Heroes ALWAYS use mana, often ridiculously exorbitant amounts, even on trivial battles.
The only way to avoid draining your mana reserves currently is to manually fight every single battle, no matter how easy.
I have the same problem.
my 2 champions used over 200 mana vs allmost harmless creatures 
Signed! Next to the button to autoresolve have a checkmark that allows you to turn it on/off.
I can beat you dark. Sovereign plus one champion used over 300 mana in one of my auto resolves. Also, auto resolve is pretty broken besides that. Instead of it actually simulating the battle, it seems to just calculate how much damage each side would do to each other and then apply that damage one at a time to each unit. This results in a few units dying because they took all the damage for some reason while some troops receive no damage.
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