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Based on voting:
Wingael is undoubtedly the best for the Sylvan faction after level 20; this is not even up for debate.
Moreover, he is practically the only hero who is immune to the hit-and-run tactic.
Naturally, his skills and abilities that increase the damage of his first attack need to be developed. That is, most likely, luck, leadership, light magic with mass acceleration, punishing strike, etc. Attack is initially given, and tactics and aura of speed allow almost everyone to reach the enemy. The incredible value of average initiative further worsens the situation for Wingael's enemies.
From his native skills, if we are going for light magic, we definitely don't take deadly shot, arrow rain, or enchanted arrow.
We don't take the super ability.