Divine Marksman's Skill: Dusk's Bow was a powerful skill but it could not be compared to the powers of Forbidden Spells. Even so, the value of the skill lied not at the range of the skill but at the targets.
A Forbidden Spell was a large nuke spell which was akin to a nuclear bomb. The destructive power lied in the massive area and killing power. The Divine Marksman's skill, on the other hand, was one that had the destructive power of a railgun—a straight line that would effectively kill all that was in it. It was a sniping skill that could instantly kill the enemy's commander.
A Divine Marksman would be the perfect counter to a Forbidden Spell user. Their skill range was much further than a magician and they could kill him or her before they knew it!