Assassin

[Swan]

Originally Posted by Stavis_L

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a) Piercer is actually armor negating, not armor piercing. Vision's Foe is also AN. All X-bows and Arbalests (including non-magic ones, with the exception of the above two) are armor piercing, so that includes the Banefire Xbow and the Just-Man's Cross.

As An ranged weapon, there is also a lv 8 construction xbow that is An and have 999 as damage.
I think that is a one shot-one kill weapon, at least from flavor text and experience.