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The fifth skill wasn't very useful for me, and regarding the third skill – the damage dealt by archers is comparable to the damage dealt by melee units, the penalty for close combat doesn't apply to everyone, and the penalty for range and obstacles (walls) only exists at the beginning of the battle and is compensated by the fact that archers can simply prevent melee units from getting close, eliminating them along the way without taking any damage. I don't think it's entirely fair to compare Heroes 3 and Heroes 5.