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In version 3.0, the Elven Archer doesn't spend a turn to cast the enchantment on the arrow. Therefore, at the beginning of the battle, he can unleash 3 Magic Arrows with the "Rain of Arrows" skill. And if he's lucky with the siege engines, the ballista will add another 3 attacks. And when the troops are mixed, 3 Siege Arrows will also deal good damage. Moreover, if the enemy doesn't want to receive 3 Magic Arrows or Siege Arrows from the ballista, they will have to spend a turn destroying it.