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I've been wanting to know for a long time... There are three artifacts (Elven Cherrywood Bow, Unicorn Hair Bowstring, and Angel Feather Arrows) that, according to their descriptions, increase ranged attack skill by a certain percentage. So, what exactly does that mean? Does it mean that all units with ranged attacks deal a certain percentage more damage? Or does it imply that if the hero doesn't have that skill, then these artifacts are useless?