If not impossible that would be extremely difficult. At level 5 even with ton of luck you'll hardly have the items, troops, spells and mana to do the job. The gremlins tower are difficult to control and in this fight there's plenty enemy magical attack this adds difficulty to use something based on target. A weird tactic based on Green dragon + invisibility could even not work because of a too low leadership at this level.
Well if you play the game without to take care of time you could perhaps use dodging intensively to collect all stuff, pay for mandatory battle in Freedom Islands, dodge again like hell up to Demonis and again dodge to collect stuff. With such weird tactic you could perhaps collect enough leadership, spells, mana bonus and even find green dragon and come back level 5 to do the Rezo tower. Very difficult but impossible I don't know.
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