You will be returning to Debir anyway so you don't have to kill the heroes now. Once you acquire access to Bolo you can get Repair Droid who will easily allow you a no-loss win. If you manage to get lucky and get yourself a Cyclops it will be very helpful as well.
On the small island on Scarlet Wind map you can get Mages who are quite sturdy at the beginning and have very useful shield ability.
And if you are very impatient Sad Orc on Debir will have some big orc units (Shamans or somesuch). They won't be killed by one spell and you can always heal them after they are hit with a spell.
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