Yes, for no losses in the hero fights it's best not to have any low HP or low level creatures and to make sure you wait until after the hero's turn each round b4 you cast so you can use the dispersal spell if your units are poisoned or burning!
Elwin, you may have no choice but to kite away the Verona map guardian and see if you can pick up the Target spell there. I think it's almost impossible to do no losses without it!
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