Ple-Sen
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In my opinion, Synitar is the best hero. IMHO, the reasons why I choose Synitar are described above by other users. I don't play as Letos for two reasons:
1) Letos is ugly and a freak (judging by the picture), and I am an aesthete.
2) He has a cheating specialization that wipes out enemy armies in the early stages (if it works and the battle is not against undead, elementals, or constructs).