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Didn't anyone say that mages are weak? Especially on resource-rich maps.
I personally struggle the most when playing as demons. I can't quickly clear out neutral creatures without taking losses. Also, they need to conserve their level 1 units for the endgame. But if you create a map where the paths to the enemy territory are guarded by around a hundred level 7 units, then the demons on that map will have time to catch up in the early game.