Майор Вихрь
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An extra army certainly won't hurt. But during a long game, creatures that join you won't be very useful unless they are from your faction. Of course, you can hope to encounter neutral Orcs (which is likely to happen on a large map), but even with diplomacy, they might not join or might ask for a hefty sum of gold, which you might not always want to give. After all, there are more useful leadership skills. Just think about the speed aura and the battle frenzy. ;)