Ple-Sen
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Firstly, it provides an additional army at the start of the game, which is a pretty good advantage (especially if the hero specializes in archers). Secondly, you can assign skills from the leadership tree to the additional hero, increasing creature and gold gains. Thirdly, he can bypass mills, dwellings, and collect resource piles, saving movement points for the main hero. Finally, he can transport the army and, if necessary, help defend the city.