Gunslinger
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Right away, the question arises: why play as Gilraen and not as Wing? Well, if you're playing as Gilraen, I would take the Secret Archers because of the initiative bonus. If the enemy hero has high speed, the archers won't even have time to shoot properly.
If I were playing as Wing, I would take the archers, but as it is, my choice is Forest Archers.