Yes no casualty is no loss through whole game. But in legend to make it you need spend hel a lot of 100 turns or so to ress all casualties ... its more boring than a challenge in my opinion ...
there is no optimum order at all .. for a mage i wuold concantrate on chaos and distortion magic and higher magic as first.
You do not have to use one army trick. There are many other ways. Tank unit with stoneskin and target on it (good with archmages maigc shield also) will do the job in most of fights. Your army is not bad for begining but lately it will be too weak
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