i think the cheapest and the effective troup is demolisher and the effective and expensive troup is that ninja ghost... The 1 handed axe is the best if u are whit a desert hero and u can start by buying a greek fire and attack the ninja towns to get the ninja ghost... Then go and attack Caesarea and get some demolishers... Then go and attack Ra Gorod and take the 1 handed axe... Then u do what u want...
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