Archer %/s (KMS Unlimited and GMS Tempest)

I don't think it's very feasible to say that Magic Arrow would hit every target in a mob. From playing Wind Archer they seem to focus on a single target and never hit all the mobs, not to mention the arrows are very flakey and spend most of their time flying all over, even missing their chance to even damage the mob cause it'll die from your mob skill before the magic arrow even lands on it.